21020122012 has 12 divisors (see below), whose sum is σ = 37971833536. Its totient is φ = 10171026720.

The previous prime is 21020122001. The next prime is 21020122049. The reversal of 21020122012 is 21022102012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21020121983 and 21020122001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84758433 + ... + 84758680.

Almost surely, 2^21020122012 is an apocalyptic number.

It is an amenable number.

21020122012 is a deficient number, since it is larger than the sum of its proper divisors (16951711524).

21020122012 is a wasteful number, since it uses less digits than its factorization.

21020122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169517148 (or 169517146 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020122012 its reverse (21022102012), we get a palindrome (42042224024).

The spelling of 21020122012 in words is "twenty-one billion, twenty million, one hundred twenty-two thousand, twelve".