21313021120 has 56 divisors (see below), whose sum is σ = 50764744800. Its totient is φ = 8523005952.

The previous prime is 21313021117. The next prime is 21313021123. The reversal of 21313021120 is 2112031312.

It is an interprime number because it is at equal distance from previous prime (21313021117) and next prime (21313021123).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21313021094 and 21313021103.

It is not an unprimeable number, because it can be changed into a prime (21313021123) by changing a digit.

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, 1875616 + ... + 1886944.

It is an arithmetic number, because the mean of its divisors is an integer number (906513300).

Almost surely, 2^21313021120 is an apocalyptic number.

21313021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313021120 is an abundant number, since it is smaller than the sum of its proper divisors (29451723680).

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

21313021120 is a wasteful number, since it uses less digits than its factorization.

21313021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17225 (or 17215 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21313021120 its reverse (2112031312), we get a palindrome (23425052432).

The spelling of 21313021120 in words is "twenty-one billion, three hundred thirteen million, twenty-one thousand, one hundred twenty".