21200012101012 has 36 divisors (see below), whose sum is σ = 37737180694836. Its totient is φ = 10420469393280.

The previous prime is 21200012100997. The next prime is 21200012101111. The reversal of 21200012101012 is 21010121000212.

It can be written as a sum of positive squares in 2 ways, for example, as 11238880773136 + 9961131327876 = 3352444^2 + 3156126^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21200012100983 and 21200012101001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3990462 + ... + 7637002.

It is an arithmetic number, because the mean of its divisors is an integer number (1048255019301).

Almost surely, 2^{21200012101012} is an apocalyptic number.

It is an amenable number.

21200012101012 is a deficient number, since it is larger than the sum of its proper divisors (16537168593824).

21200012101012 is a wasteful number, since it uses less digits than its factorization.

21200012101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646888 (or 3646783 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21200012101012 its reverse (21010121000212), we get a palindrome (42210133101224).

The spelling of 21200012101012 in words is "twenty-one trillion, two hundred billion, twelve million, one hundred one thousand, twelve".