21200121022111 has 16 divisors (see below), whose sum is σ = 23036104396800. Its totient is φ = 19436174359200.

The previous prime is 21200121022097. The next prime is 21200121022133. The reversal of 21200121022111 is 11122012100212.

It is a cyclic number.

It is not a de Polignac number, because 21200121022111 - 2⁷ = 21200121021983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200121023111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51337146 + ... + 51748456.

It is an arithmetic number, because the mean of its divisors is an integer number (1439756524800).

Almost surely, 2^{21200121022111} is an apocalyptic number.

21200121022111 is a deficient number, since it is larger than the sum of its proper divisors (1835983374689).

21200121022111 is a wasteful number, since it uses less digits than its factorization.

21200121022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498870.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21200121022111 its reverse (11122012100212), we get a palindrome (32322133122323).

The spelling of 21200121022111 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, twenty-two thousand, one hundred eleven".