21872626 has 8 divisors (see below), whose sum is σ = 32849964. Its totient is φ = 10922640.

The previous prime is 21872611. The next prime is 21872647. The reversal of 21872626 is 62627812.

It can be written as a sum of positive squares in 2 ways, for example, as 15992001 + 5880625 = 3999^2 + 2425^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21872591 and 21872600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4705 + ... + 8116.

Almost surely, 2^21872626 is an apocalyptic number.

21872626 is a deficient number, since it is larger than the sum of its proper divisors (10977338).

21872626 is a wasteful number, since it uses less digits than its factorization.

21872626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13676.

The product of its digits is 16128, while the sum is 34.

The square root of 21872626 is about 4676.8179353060. The cubic root of 21872626 is about 279.6621179446.

The spelling of 21872626 in words is "twenty-one million, eight hundred seventy-two thousand, six hundred twenty-six".