64266021 has 8 divisors (see below), whose sum is σ = 95208960. Its totient is φ = 42843996.

The previous prime is 64265989. The next prime is 64266023. The reversal of 64266021 is 12066246.

It is a happy number.

It is not a de Polignac number, because 64266021 - 2⁵ = 64265989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2380223 = 64266021 / (6 + 4 + 2 + 6 + 6 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64266023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1190085 + ... + 1190138.

It is an arithmetic number, because the mean of its divisors is an integer number (11901120).

Almost surely, 2^64266021 is an apocalyptic number.

It is an amenable number.

64266021 is a deficient number, since it is larger than the sum of its proper divisors (30942939).

64266021 is a wasteful number, since it uses less digits than its factorization.

64266021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380232 (or 2380226 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 64266021 is about 8016.6090711722. The cubic root of 64266021 is about 400.5534443120.

It can be divided in two parts, 64 and 266021, that added together give a triangular number (266085 = T₇₂₉).

The spelling of 64266021 in words is "sixty-four million, two hundred sixty-six thousand, twenty-one".