21111213432 has 32 divisors (see below), whose sum is σ = 54204469200. Its totient is φ = 6846879744.

The previous prime is 21111213407. The next prime is 21111213437. The reversal of 21111213432 is 23431211112.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21111213399 and 21111213408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111213437) 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, 11886057 + ... + 11887832.

Almost surely, 2^21111213432 is an apocalyptic number.

It is an amenable number.

21111213432 is an abundant number, since it is smaller than the sum of its proper divisors (33093255768).

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

21111213432 is a wasteful number, since it uses less digits than its factorization.

21111213432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23773935 (or 23773931 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 21111213432 its reverse (23431211112), we get a palindrome (44542424544).

The spelling of 21111213432 in words is "twenty-one billion, one hundred eleven million, two hundred thirteen thousand, four hundred thirty-two".