21200121012010 has 16 divisors (see below), whose sum is σ = 38785795164072. Its totient is φ = 8341031217600.

The previous prime is 21200121012001. The next prime is 21200121012047. The reversal of 21200121012010 is 1021012100212.

It can be written as a sum of positive squares in 4 ways, for example, as 13527558948289 + 7672562063721 = 3677983^2 + 2769939^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17377147761 + ... + 17377148980.

Almost surely, 2^{21200121012010} is an apocalyptic number.

21200121012010 is a deficient number, since it is larger than the sum of its proper divisors (17585674152062).

21200121012010 is a wasteful number, since it uses less digits than its factorization.

21200121012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34754296809.

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

Adding to 21200121012010 its reverse (1021012100212), we get a palindrome (22221133112222).

The spelling of 21200121012010 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, twelve thousand, ten".