21231102020 has 24 divisors (see below), whose sum is σ = 44604000000. Its totient is φ = 8488881632.

The previous prime is 21231102017. The next prime is 21231102041. The reversal of 21231102020 is 2020113212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21231101986 and 21231102004.

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, 173270 + ... + 269229.

It is an arithmetic number, because the mean of its divisors is an integer number (1858500000).

Almost surely, 2^21231102020 is an apocalyptic number.

21231102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231102020 is an abundant number, since it is smaller than the sum of its proper divisors (23372897980).

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

21231102020 is a wasteful number, since it uses less digits than its factorization.

21231102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444907 (or 444905 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21231102020 its reverse (2020113212), we get a palindrome (23251215232).

The spelling of 21231102020 in words is "twenty-one billion, two hundred thirty-one million, one hundred two thousand, twenty".