21121022122012 has 12 divisors (see below), whose sum is σ = 37320641031856. Its totient is φ = 10457981827200.

The previous prime is 21121022122003. The next prime is 21121022122099. The reversal of 21121022122012 is 21022122012112.

It is a congruent number.

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, 25632307989 + ... + 25632308812.

Almost surely, 2^{21121022122012} is an apocalyptic number.

It is an amenable number.

21121022122012 is a deficient number, since it is larger than the sum of its proper divisors (16199618909844).

21121022122012 is a wasteful number, since it uses less digits than its factorization.

21121022122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51264616908 (or 51264616906 counting only the distinct ones).

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

Adding to 21121022122012 its reverse (21022122012112), we get a palindrome (42143144134124).

The spelling of 21121022122012 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-two thousand, twelve".