21403652 has 12 divisors (see below), whose sum is σ = 39427920. Its totient is φ = 10138536.

The previous prime is 21403643. The next prime is 21403667. The reversal of 21403652 is 25630412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140738 + ... + 140889.

It is an arithmetic number, because the mean of its divisors is an integer number (3285660).

Almost surely, 2^21403652 is an apocalyptic number.

It is an amenable number.

21403652 is a deficient number, since it is larger than the sum of its proper divisors (18024268).

21403652 is a wasteful number, since it uses less digits than its factorization.

21403652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281650 (or 281648 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21403652 is about 4626.4081099704. The cubic root of 21403652 is about 277.6489020422.

The spelling of 21403652 in words is "twenty-one million, four hundred three thousand, six hundred fifty-two".