21210120000191 has 16 divisors (see below), whose sum is σ = 22043209708800. Its totient is φ = 20386360450560.

The previous prime is 21210120000161. The next prime is 21210120000233. The reversal of 21210120000191 is 19100002101212.

It is a cyclic number.

It is not a de Polignac number, because 21210120000191 - 2²² = 21210115805887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210120000131) 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, 53535461 + ... + 53930193.

It is an arithmetic number, because the mean of its divisors is an integer number (1377700606800).

Almost surely, 2^{21210120000191} is an apocalyptic number.

21210120000191 is a deficient number, since it is larger than the sum of its proper divisors (833089708609).

21210120000191 is a wasteful number, since it uses less digits than its factorization.

21210120000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406546.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21210120000191 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred ninety-one", and thus it is an aban number.