21113332212 has 24 divisors (see below), whose sum is σ = 56302219456. Its totient is φ = 6032380608.

The previous prime is 21113332169. The next prime is 21113332249. The reversal of 21113332212 is 21223331112.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a congruent number.

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, 125674513 + ... + 125674680.

Almost surely, 2^21113332212 is an apocalyptic number.

It is an amenable number.

21113332212 is an abundant number, since it is smaller than the sum of its proper divisors (35188887244).

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

21113332212 is a wasteful number, since it uses less digits than its factorization.

21113332212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251349207 (or 251349205 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 21113332212 its reverse (21223331112), we get a palindrome (42336663324).

The spelling of 21113332212 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, two hundred twelve".