2137694921 has 4 divisors (see below), whose sum is σ = 2250205200. Its totient is φ = 2025184644.

The previous prime is 2137694917. The next prime is 2137694953. The reversal of 2137694921 is 1294967312.

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 2137694921 - 2² = 2137694917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2137696921) 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, 56255111 + ... + 56255148.

It is an arithmetic number, because the mean of its divisors is an integer number (562551300).

Almost surely, 2^2137694921 is an apocalyptic number.

It is an amenable number.

2137694921 is a deficient number, since it is larger than the sum of its proper divisors (112510279).

2137694921 is a wasteful number, since it uses less digits than its factorization.

2137694921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112510278.

The product of its digits is 163296, while the sum is 44.

The square root of 2137694921 is about 46235.2129983198. The cubic root of 2137694921 is about 1288.1958878103.

The spelling of 2137694921 in words is "two billion, one hundred thirty-seven million, six hundred ninety-four thousand, nine hundred twenty-one".