21221122012012 has 12 divisors (see below), whose sum is σ = 39993653022736. Its totient is φ = 9794364005520.

The previous prime is 21221122011989. The next prime is 21221122012061. The reversal of 21221122012012 is 21021022112212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204049250064 + ... + 204049250167.

Almost surely, 2^{21221122012012} is an apocalyptic number.

It is an amenable number.

21221122012012 is a deficient number, since it is larger than the sum of its proper divisors (18772531010724).

21221122012012 is a wasteful number, since it uses less digits than its factorization.

21221122012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408098500248 (or 408098500246 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221122012012 its reverse (21021022112212), we get a palindrome (42242144124224).

The spelling of 21221122012012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, twelve".