69137021 has 4 divisors (see below), whose sum is σ = 69192192. Its totient is φ = 69081852.

The previous prime is 69137017. The next prime is 69137023. The reversal of 69137021 is 12073196.

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 not a de Polignac number, because 69137021 - 2² = 69137017 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 (69137023) 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, 25661 + ... + 28226.

It is an arithmetic number, because the mean of its divisors is an integer number (17298048).

Almost surely, 2^69137021 is an apocalyptic number.

It is an amenable number.

69137021 is a deficient number, since it is larger than the sum of its proper divisors (55171).

69137021 is a wasteful number, since it uses less digits than its factorization.

69137021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55170.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 69137021 is about 8314.8674673743. The cubic root of 69137021 is about 410.4279113596.

The spelling of 69137021 in words is "sixty-nine million, one hundred thirty-seven thousand, twenty-one".