21201301320 has 64 divisors (see below), whose sum is σ = 63614600640. Its totient is φ = 5652729600.

The previous prime is 21201301313. The next prime is 21201301327. The reversal of 21201301320 is 2310310212.

It is an interprime number because it is at equal distance from previous prime (21201301313) and next prime (21201301327).

It is a super-2 number, since 2×21201301320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21201301320.

It is not an unprimeable number, because it can be changed into a prime (21201301327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 975775 + ... + 997265.

It is an arithmetic number, because the mean of its divisors is an integer number (993978135).

Almost surely, 2^21201301320 is an apocalyptic number.

21201301320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201301320 is an abundant number, since it is smaller than the sum of its proper divisors (42413299320).

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

21201301320 is a wasteful number, since it uses less digits than its factorization.

21201301320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29726 (or 29722 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21201301320 its reverse (2310310212), we get a palindrome (23511611532).

The spelling of 21201301320 in words is "twenty-one billion, two hundred one million, three hundred one thousand, three hundred twenty".