21121020232 has 16 divisors (see below), whose sum is σ = 42648214140. Its totient is φ = 9748163136.

The previous prime is 21121020229. The next prime is 21121020233. The reversal of 21121020232 is 23202012112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19062220356 + 2058799876 = 138066^2 + 45374^2 .

It is not an unprimeable number, because it can be changed into a prime (21121020233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101543263 + ... + 101543470.

Almost surely, 2^21121020232 is an apocalyptic number.

It is an amenable number.

21121020232 is an abundant number, since it is smaller than the sum of its proper divisors (21527193908).

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

21121020232 is a wasteful number, since it uses less digits than its factorization.

21121020232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203086752 (or 203086748 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21121020232 its reverse (23202012112), we get a palindrome (44323032344).

The spelling of 21121020232 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred thirty-two".