21132111020 has 24 divisors (see below), whose sum is σ = 44480415168. Its totient is φ = 8433228800.

The previous prime is 21132110999. The next prime is 21132111023. The reversal of 21132111020 is 2011123112.

It is a super-2 number, since 2×21132111020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21132110986 and 21132111004.

It is not an unprimeable number, because it can be changed into a prime (21132111023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217141 + ... + 1234380.

It is an arithmetic number, because the mean of its divisors is an integer number (1853350632).

Almost surely, 2^21132111020 is an apocalyptic number.

21132111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132111020 is an abundant number, since it is smaller than the sum of its proper divisors (23348304148).

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

21132111020 is a wasteful number, since it uses less digits than its factorization.

21132111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451961 (or 2451959 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21132111020 its reverse (2011123112), we get a palindrome (23143234132).

The spelling of 21132111020 in words is "twenty-one billion, one hundred thirty-two million, one hundred eleven thousand, twenty".