21010311320 has 32 divisors (see below), whose sum is σ = 47374470000. Its totient is φ = 8386121088.

The previous prime is 21010311317. The next prime is 21010311353. The reversal of 21010311320 is 2311301012.

It is a junction number, because it is equal to n+sod(n) for n = 21010311295 and 21010311304.

It is a congruent number.

It is an unprimeable number.

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, 543695 + ... + 581054.

Almost surely, 2^21010311320 is an apocalyptic number.

21010311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010311320 is an abundant number, since it is smaller than the sum of its proper divisors (26364158680).

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

21010311320 is a wasteful number, since it uses less digits than its factorization.

21010311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125227 (or 1125223 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21010311320 its reverse (2311301012), we get a palindrome (23321612332).

The spelling of 21010311320 in words is "twenty-one billion, ten million, three hundred eleven thousand, three hundred twenty".