21365662 has 4 divisors (see below), whose sum is σ = 32048496. Its totient is φ = 10682830.

The previous prime is 21365657. The next prime is 21365699. The reversal of 21365662 is 26656312.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341414 + ... + 5341417.

It is an arithmetic number, because the mean of its divisors is an integer number (8012124).

Almost surely, 2^21365662 is an apocalyptic number.

21365662 is a deficient number, since it is larger than the sum of its proper divisors (10682834).

21365662 is a wasteful number, since it uses less digits than its factorization.

21365662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682833.

The product of its digits is 12960, while the sum is 31.

The square root of 21365662 is about 4622.3005094866. The cubic root of 21365662 is about 277.4845355665.

The spelling of 21365662 in words is "twenty-one million, three hundred sixty-five thousand, six hundred sixty-two".