21300332420 has 24 divisors (see below), whose sum is σ = 45939637464. Its totient is φ = 8289858816.

The previous prime is 21300332411. The next prime is 21300332429. The reversal of 21300332420 is 2423300312.

It is an interprime number because it is at equal distance from previous prime (21300332411) and next prime (21300332429).

It can be written as a sum of positive squares in 4 ways, for example, as 1682968576 + 19617363844 = 41024^2 + 140062^2 .

It is a super-2 number, since 2×21300332420² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21300332392 and 21300332401.

It is not an unprimeable number, because it can be changed into a prime (21300332429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14391377 + ... + 14392856.

It is an arithmetic number, because the mean of its divisors is an integer number (1914151561).

Almost surely, 2^21300332420 is an apocalyptic number.

21300332420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300332420 is an abundant number, since it is smaller than the sum of its proper divisors (24639305044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21300332420 is a wasteful number, since it uses less digits than its factorization.

21300332420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28784279 (or 28784277 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21300332420 its reverse (2423300312), we get a palindrome (23723632732).

The spelling of 21300332420 in words is "twenty-one billion, three hundred million, three hundred thirty-two thousand, four hundred twenty".