21274254 has 24 divisors (see below), whose sum is σ = 46186920. Its totient is φ = 7077168.

The previous prime is 21274249. The next prime is 21274261. The reversal of 21274254 is 45247212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11929 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (1924455).

Almost surely, 2^21274254 is an apocalyptic number.

21274254 is an abundant number, since it is smaller than the sum of its proper divisors (24912666).

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

21274254 is a wasteful number, since it uses less digits than its factorization.

21274254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2381 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 21274254 is about 4612.4021940850. The cubic root of 21274254 is about 277.0882522779.

It can be divided in two parts, 21274 and 254, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21274254 in words is "twenty-one million, two hundred seventy-four thousand, two hundred fifty-four".