21200111022209 has 16 divisors (see below), whose sum is σ = 24256128758400. Its totient is φ = 18150953086464.

The previous prime is 21200111022203. The next prime is 21200111022263. The reversal of 21200111022209 is 90222011100212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200111022209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200111022203) 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, 131403539 + ... + 131564775.

It is an arithmetic number, because the mean of its divisors is an integer number (1516008047400).

Almost surely, 2^{21200111022209} is an apocalyptic number.

It is an amenable number.

21200111022209 is a deficient number, since it is larger than the sum of its proper divisors (3056017736191).

21200111022209 is a wasteful number, since it uses less digits than its factorization.

21200111022209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182392.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21200111022209 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, twenty-two thousand, two hundred nine".