21121022212 has 48 divisors (see below), whose sum is σ = 39150034560. Its totient is φ = 9942421248.

The previous prime is 21121022189. The next prime is 21121022227. The reversal of 21121022212 is 21222012112.

It is a happy 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, 13687513 + ... + 13689055.

It is an arithmetic number, because the mean of its divisors is an integer number (815625720).

Almost surely, 2^21121022212 is an apocalyptic number.

It is an amenable number.

21121022212 is a deficient number, since it is larger than the sum of its proper divisors (18029012348).

21121022212 is a wasteful number, since it uses less digits than its factorization.

21121022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2570 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121022212 its reverse (21222012112), we get a palindrome (42343034324).

The spelling of 21121022212 in words is "twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twelve".