21618862 has 8 divisors (see below), whose sum is σ = 33546600. Its totient is φ = 10436664.

The previous prime is 21618847. The next prime is 21618889. The reversal of 21618862 is 26881612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 186312 + ... + 186427.

It is an arithmetic number, because the mean of its divisors is an integer number (4193325).

Almost surely, 2^21618862 is an apocalyptic number.

21618862 is a deficient number, since it is larger than the sum of its proper divisors (11927738).

21618862 is a wasteful number, since it uses less digits than its factorization.

21618862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372770.

The product of its digits is 9216, while the sum is 34.

The square root of 21618862 is about 4649.6088007487. The cubic root of 21618862 is about 278.5763709214.

The spelling of 21618862 in words is "twenty-one million, six hundred eighteen thousand, eight hundred sixty-two".