21712652 has 24 divisors (see below), whose sum is σ = 41503392. Its totient is φ = 9878400.

The previous prime is 21712651. The next prime is 21712661. The reversal of 21712652 is 25621712.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21712651) 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, 752 + ... + 6632.

It is an arithmetic number, because the mean of its divisors is an integer number (1729308).

Almost surely, 2^21712652 is an apocalyptic number.

It is an amenable number.

21712652 is a deficient number, since it is larger than the sum of its proper divisors (19790740).

21712652 is a wasteful number, since it uses less digits than its factorization.

21712652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969 (or 5967 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21712652 is about 4659.6836802513. The cubic root of 21712652 is about 278.9786428670.

The spelling of 21712652 in words is "twenty-one million, seven hundred twelve thousand, six hundred fifty-two".