21311001120 has 48 divisors (see below), whose sum is σ = 67129655040. Its totient is φ = 5682933504.

The previous prime is 21311001113. The next prime is 21311001143. The reversal of 21311001120 is 2110011312.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21311001096 and 21311001105.

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, 22198480 + ... + 22199439.

It is an arithmetic number, because the mean of its divisors is an integer number (1398534480).

Almost surely, 2^21311001120 is an apocalyptic number.

21311001120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311001120 is an abundant number, since it is smaller than the sum of its proper divisors (45818653920).

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

21311001120 is a wasteful number, since it uses less digits than its factorization.

21311001120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44397937 (or 44397929 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21311001120 its reverse (2110011312), we get a palindrome (23421012432).

The spelling of 21311001120 in words is "twenty-one billion, three hundred eleven million, one thousand, one hundred twenty".