21252627 has 12 divisors (see below), whose sum is σ = 33489144. Its totient is φ = 12880320.

The previous prime is 21252617. The next prime is 21252653. The reversal of 21252627 is 72625212.

It is not a de Polignac number, because 21252627 - 2⁴ = 21252611 is a prime.

It is a super-2 number, since 2×21252627² = 903348308802258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21252627.

It is not an unprimeable number, because it can be changed into a prime (21252607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107238 + ... + 107435.

It is an arithmetic number, because the mean of its divisors is an integer number (2790762).

Almost surely, 2^21252627 is an apocalyptic number.

21252627 is a deficient number, since it is larger than the sum of its proper divisors (12236517).

21252627 is a wasteful number, since it uses less digits than its factorization.

21252627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214690 (or 214687 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21252627 is about 4610.0571579971. The cubic root of 21252627 is about 276.9943262358.

Adding to 21252627 its reverse (72625212), we get a palindrome (93877839).

The spelling of 21252627 in words is "twenty-one million, two hundred fifty-two thousand, six hundred twenty-seven".