21102201320 has 32 divisors (see below), whose sum is σ = 50272893000. Its totient is φ = 7944357888.

The previous prime is 21102201319. The next prime is 21102201349. The reversal of 21102201320 is 2310220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20984999044 + 117202276 = 144862^2 + 10826^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102201295 and 21102201304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15515645 + ... + 15517004.

Almost surely, 2^21102201320 is an apocalyptic number.

21102201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102201320 is an abundant number, since it is smaller than the sum of its proper divisors (29170691680).

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

21102201320 is a wasteful number, since it uses less digits than its factorization.

21102201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31032677 (or 31032673 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21102201320 its reverse (2310220112), we get a palindrome (23412421432).

The spelling of 21102201320 in words is "twenty-one billion, one hundred two million, two hundred one thousand, three hundred twenty".