21311040120 has 32 divisors (see below), whose sum is σ = 63933120720. Its totient is φ = 5682944000.

The previous prime is 21311040083. The next prime is 21311040133. The reversal of 21311040120 is 2104011312.

It is a super-2 number, since 2×21311040120² (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 21311040120.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88795881 + ... + 88796120.

Almost surely, 2^21311040120 is an apocalyptic number.

21311040120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311040120 is an abundant number, since it is smaller than the sum of its proper divisors (42622080600).

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

21311040120 is a wasteful number, since it uses less digits than its factorization.

21311040120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177592015 (or 177592011 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21311040120 its reverse (2104011312), we get a palindrome (23415051432).

The spelling of 21311040120 in words is "twenty-one billion, three hundred eleven million, forty thousand, one hundred twenty".