21274762 has 4 divisors (see below), whose sum is σ = 31912146. Its totient is φ = 10637380.

The previous prime is 21274739. The next prime is 21274763. The reversal of 21274762 is 26747212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 2430481 = 4341^2 + 1559^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21274763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5318689 + ... + 5318692.

Almost surely, 2^21274762 is an apocalyptic number.

21274762 is a deficient number, since it is larger than the sum of its proper divisors (10637384).

21274762 is a wasteful number, since it uses less digits than its factorization.

21274762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10637383.

The product of its digits is 9408, while the sum is 31.

The square root of 21274762 is about 4612.4572626746. The cubic root of 21274762 is about 277.0904577561.

It can be divided in two parts, 2127 and 4762, that added together give a square (6889 = 83²).

The spelling of 21274762 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred sixty-two".