21150302420 has 48 divisors (see below), whose sum is σ = 49375216128. Its totient is φ = 7557425280.

The previous prime is 21150302399. The next prime is 21150302423. The reversal of 21150302420 is 2420305112.

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 = 21150302392 and 21150302401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150302423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303994 + ... + 1320113.

It is an arithmetic number, because the mean of its divisors is an integer number (1028650336).

Almost surely, 2^21150302420 is an apocalyptic number.

21150302420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150302420 is an abundant number, since it is smaller than the sum of its proper divisors (28224913708).

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

21150302420 is a wasteful number, since it uses less digits than its factorization.

21150302420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624160 (or 2624158 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21150302420 its reverse (2420305112), we get a palindrome (23570607532).

The spelling of 21150302420 in words is "twenty-one billion, one hundred fifty million, three hundred two thousand, four hundred twenty".