21012202012 has 12 divisors (see below), whose sum is σ = 37668216096. Its totient is φ = 10249854560.

The previous prime is 21012202007. The next prime is 21012202067. The reversal of 21012202012 is 21020221012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012201983 and 21012202001.

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, 64061428 + ... + 64061755.

It is an arithmetic number, because the mean of its divisors is an integer number (3139018008).

Almost surely, 2^21012202012 is an apocalyptic number.

It is an amenable number.

21012202012 is a deficient number, since it is larger than the sum of its proper divisors (16656014084).

21012202012 is a wasteful number, since it uses less digits than its factorization.

21012202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128123228 (or 128123226 counting only the distinct ones).

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

Adding to 21012202012 its reverse (21020221012), we get a palindrome (42032423024).

The spelling of 21012202012 in words is "twenty-one billion, twelve million, two hundred two thousand, twelve".