69090021 has 48 divisors (see below), whose sum is σ = 134010240. Its totient is φ = 33125760.

The previous prime is 69090019. The next prime is 69090037. The reversal of 69090021 is 12009096.

It is a happy number.

It is not a de Polignac number, because 69090021 - 2¹ = 69090019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69090001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5175 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (2791880).

Almost surely, 2^69090021 is an apocalyptic number.

It is an amenable number.

69090021 is a deficient number, since it is larger than the sum of its proper divisors (64920219).

69090021 is a wasteful number, since it uses less digits than its factorization.

69090021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7706 (or 7703 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 69090021 is about 8312.0407241543. The cubic root of 69090021 is about 410.3348860194.

The spelling of 69090021 in words is "sixty-nine million, ninety thousand, twenty-one".