2137171252091 has 4 divisors (see below), whose sum is σ = 2137174496352. Its totient is φ = 2137168007832.

The previous prime is 2137171252087. The next prime is 2137171252189. The reversal of 2137171252091 is 1902521717312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2137171252091 - 2² = 2137171252087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2137171252891) 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, 243356 + ... + 2081721.

It is an arithmetic number, because the mean of its divisors is an integer number (534293624088).

Almost surely, 2^{2137171252091} is an apocalyptic number.

2137171252091 is a deficient number, since it is larger than the sum of its proper divisors (3244261).

2137171252091 is an equidigital number, since it uses as much as digits as its factorization.

2137171252091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244260.

The product of its (nonzero) digits is 52920, while the sum is 41.

The spelling of 2137171252091 in words is "two trillion, one hundred thirty-seven billion, one hundred seventy-one million, two hundred fifty-two thousand, ninety-one".