21402627 has 16 divisors (see below), whose sum is σ = 29902848. Its totient is φ = 13590720.

The previous prime is 21402593. The next prime is 21402637. The reversal of 21402627 is 72620412.

It is not a de Polignac number, because 21402627 - 2⁷ = 21402499 is a prime.

It is a super-2 number, since 2×21402627² = 916144885002258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21402597 and 21402606.

It is not an unprimeable number, because it can be changed into a prime (21402637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21102 + ... + 22092.

It is an arithmetic number, because the mean of its divisors is an integer number (1868928).

Almost surely, 2^21402627 is an apocalyptic number.

21402627 is a deficient number, since it is larger than the sum of its proper divisors (8500221).

21402627 is a wasteful number, since it uses less digits than its factorization.

21402627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21402627 is about 4626.2973315601. The cubic root of 21402627 is about 277.6444698598.

The spelling of 21402627 in words is "twenty-one million, four hundred two thousand, six hundred twenty-seven".