69697021 has 4 divisors (see below), whose sum is σ = 71945344. Its totient is φ = 67448700.

The previous prime is 69697013. The next prime is 69697027. The reversal of 69697021 is 12079696.

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 69697021 - 2³ = 69697013 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 (69697027) 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, 1124115 + ... + 1124176.

It is an arithmetic number, because the mean of its divisors is an integer number (17986336).

Almost surely, 2^69697021 is an apocalyptic number.

It is an amenable number.

69697021 is a deficient number, since it is larger than the sum of its proper divisors (2248323).

69697021 is a wasteful number, since it uses less digits than its factorization.

69697021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248322.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 69697021 is about 8348.4741719670. The cubic root of 69697021 is about 411.5330686663.

The spelling of 69697021 in words is "sixty-nine million, six hundred ninety-seven thousand, twenty-one".