21652402 has 4 divisors (see below), whose sum is σ = 32478606. Its totient is φ = 10826200.

The previous prime is 21652391. The next prime is 21652427. The reversal of 21652402 is 20425612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 4004001 = 4201^2 + 2001^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5413099 + ... + 5413102.

Almost surely, 2^21652402 is an apocalyptic number.

21652402 is a deficient number, since it is larger than the sum of its proper divisors (10826204).

21652402 is a wasteful number, since it uses less digits than its factorization.

21652402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10826203.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21652402 is about 4653.2141579773. The cubic root of 21652402 is about 278.7203597486.

The spelling of 21652402 in words is "twenty-one million, six hundred fifty-two thousand, four hundred two".