21274550 has 48 divisors (see below), whose sum is σ = 44140032. Its totient is φ = 7562400.

The previous prime is 21274549. The next prime is 21274553. The reversal of 21274550 is 5547212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25439 + ... + 26261.

It is an arithmetic number, because the mean of its divisors is an integer number (919584).

Almost surely, 2^21274550 is an apocalyptic number.

21274550 is an abundant number, since it is smaller than the sum of its proper divisors (22865482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21274550 is a wasteful number, since it uses less digits than its factorization.

21274550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21274550 is about 4612.4342813746. The cubic root of 21274550 is about 277.0895373640.

The spelling of 21274550 in words is "twenty-one million, two hundred seventy-four thousand, five hundred fifty".