21274450 has 12 divisors (see below), whose sum is σ = 39570570. Its totient is φ = 8509760.

The previous prime is 21274441. The next prime is 21274453. The reversal of 21274450 is 5447212.

It can be written as a sum of positive squares in 3 ways, for example, as 13816089 + 7458361 = 3717^2 + 2731^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21274453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212695 + ... + 212794.

Almost surely, 2^21274450 is an apocalyptic number.

21274450 is a deficient number, since it is larger than the sum of its proper divisors (18296120).

21274450 is a wasteful number, since it uses less digits than its factorization.

21274450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425501 (or 425496 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21274450 is about 4612.4234410990. The cubic root of 21274450 is about 277.0891032146.

The spelling of 21274450 in words is "twenty-one million, two hundred seventy-four thousand, four hundred fifty".