21102232212 has 48 divisors (see below), whose sum is σ = 54954887680. Its totient is φ = 7002526464.

The previous prime is 21102232199. The next prime is 21102232271. The reversal of 21102232212 is 21223220112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414013 + ... + 462180.

Almost surely, 2^21102232212 is an apocalyptic number.

It is an amenable number.

21102232212 is an abundant number, since it is smaller than the sum of its proper divisors (33852655468).

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

21102232212 is a wasteful number, since it uses less digits than its factorization.

21102232212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876429 (or 876421 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21102232212 its reverse (21223220112), we get a palindrome (42325452324).

It can be divided in two parts, 2110 and 2232212, that added together give a palindrome (2234322).

The spelling of 21102232212 in words is "twenty-one billion, one hundred two million, two hundred thirty-two thousand, two hundred twelve".