201939374185921 has 4 divisors (see below), whose sum is σ = 203899950634432. Its totient is φ = 199978797737412.

The previous prime is 201939374185919. The next prime is 201939374185937. The reversal of 201939374185921 is 129581473939102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201939374185921 - 2¹ = 201939374185919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201939374185321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980288224101 + ... + 980288224306.

It is an arithmetic number, because the mean of its divisors is an integer number (50974987658608).

Almost surely, 2^{201939374185921} is an apocalyptic number.

It is an amenable number.

201939374185921 is a deficient number, since it is larger than the sum of its proper divisors (1960576448511).

201939374185921 is a wasteful number, since it uses less digits than its factorization.

201939374185921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960576448510.

The product of its (nonzero) digits is 29393280, while the sum is 64.

The spelling of 201939374185921 in words is "two hundred one trillion, nine hundred thirty-nine billion, three hundred seventy-four million, one hundred eighty-five thousand, nine hundred twenty-one".