21331213230 has 64 divisors (see below), whose sum is σ = 51503169600. Its totient is φ = 5654175744.

The previous prime is 21331213223. The next prime is 21331213283. The reversal of 21331213230 is 3231213312.

It is a junction number, because it is equal to n+sod(n) for n = 21331213197 and 21331213206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3728332 + ... + 3734048.

It is an arithmetic number, because the mean of its divisors is an integer number (804737025).

Almost surely, 2^21331213230 is an apocalyptic number.

21331213230 is an abundant number, since it is smaller than the sum of its proper divisors (30171956370).

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

21331213230 is a wasteful number, since it uses less digits than its factorization.

21331213230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6453.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21331213230 its reverse (3231213312), we get a palindrome (24562426542).

The spelling of 21331213230 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirteen thousand, two hundred thirty".