21311111120 has 40 divisors (see below), whose sum is σ = 53359746216. Its totient is φ = 7868717568.

The previous prime is 21311111099. The next prime is 21311111147. The reversal of 21311111120 is 2111111312.

It can be written as a sum of positive squares in 4 ways, for example, as 180418624 + 21130692496 = 13432^2 + 145364^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21311111095 and 21311111104.

It is a congruent number.

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, 10244687 + ... + 10246766.

Almost surely, 2^21311111120 is an apocalyptic number.

21311111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311111120 is an abundant number, since it is smaller than the sum of its proper divisors (32048635096).

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

21311111120 is a wasteful number, since it uses less digits than its factorization.

21311111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20491479 (or 20491473 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21311111120 its reverse (2111111312), we get a palindrome (23422222432).

The spelling of 21311111120 in words is "twenty-one billion, three hundred eleven million, one hundred eleven thousand, one hundred twenty".