21275376 has 20 divisors (see below), whose sum is σ = 54961512. Its totient is φ = 7091776.

The previous prime is 21275369. The next prime is 21275399. The reversal of 21275376 is 67357212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221571 + ... + 221666.

Almost surely, 2^21275376 is an apocalyptic number.

It is an amenable number.

21275376 is an abundant number, since it is smaller than the sum of its proper divisors (33686136).

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

21275376 is a wasteful number, since it uses less digits than its factorization.

21275376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443248 (or 443242 counting only the distinct ones).

The product of its digits is 17640, while the sum is 33.

The square root of 21275376 is about 4612.5238210767. The cubic root of 21275376 is about 277.0931233857.

It can be divided in two parts, 2127 and 5376, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 21275376 in words is "twenty-one million, two hundred seventy-five thousand, three hundred seventy-six".