69990021 has 16 divisors (see below), whose sum is σ = 107265600. Its totient is φ = 45050544.

The previous prime is 69989923. The next prime is 69990029. The reversal of 69990021 is 12009996.

It is not a de Polignac number, because 69990021 - 2¹⁷ = 69858949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69990029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43911 + ... + 45476.

It is an arithmetic number, because the mean of its divisors is an integer number (6704100).

Almost surely, 2^69990021 is an apocalyptic number.

It is an amenable number.

69990021 is a deficient number, since it is larger than the sum of its proper divisors (37275579).

69990021 is a wasteful number, since it uses less digits than its factorization.

69990021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89425 (or 89419 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 69990021 is about 8366.0038847708. The cubic root of 69990021 is about 412.1089450949.

The spelling of 69990021 in words is "sixty-nine million, nine hundred ninety thousand, twenty-one".