21261627 has 12 divisors (see below), whose sum is σ = 32327880. Its totient is φ = 13428288.

The previous prime is 21261623. The next prime is 21261631. The reversal of 21261627 is 72616212.

21261627 is a `hidden beast` number, since 21 + 2 + 616 + 27 = 666.

It is an interprime number because it is at equal distance from previous prime (21261623) and next prime (21261631).

It is not a de Polignac number, because 21261627 - 2² = 21261623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21261627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61998 + ... + 62339.

It is an arithmetic number, because the mean of its divisors is an integer number (2693990).

Almost surely, 2^21261627 is an apocalyptic number.

21261627 is a deficient number, since it is larger than the sum of its proper divisors (11066253).

21261627 is a wasteful number, since it uses less digits than its factorization.

21261627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124362 (or 124359 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21261627 is about 4611.0331814031. The cubic root of 21261627 is about 277.0334209654.

Adding to 21261627 its reverse (72616212), we get a palindrome (93877839).

The spelling of 21261627 in words is "twenty-one million, two hundred sixty-one thousand, six hundred twenty-seven".