21274635 has 16 divisors (see below), whose sum is σ = 34097184. Its totient is φ = 11327232.

The previous prime is 21274619. The next prime is 21274639. The reversal of 21274635 is 53647212.

It is not a de Polignac number, because 21274635 - 2⁴ = 21274619 is a prime.

It is a super-2 number, since 2×21274635² = 905220188766450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21274639) 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, 14809 + ... + 16181.

It is an arithmetic number, because the mean of its divisors is an integer number (2131074).

Almost surely, 2^21274635 is an apocalyptic number.

21274635 is a deficient number, since it is larger than the sum of its proper divisors (12822549).

21274635 is a wasteful number, since it uses less digits than its factorization.

21274635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414.

The product of its digits is 10080, while the sum is 30.

The square root of 21274635 is about 4612.4434955889. The cubic root of 21274635 is about 277.0899063899.

It can be divided in two parts, 212 and 74635, that added together give a palindrome (74847).

The spelling of 21274635 in words is "twenty-one million, two hundred seventy-four thousand, six hundred thirty-five".