21355376 has 30 divisors (see below), whose sum is σ = 48133080. Its totient is φ = 9151968.

The previous prime is 21355351. The next prime is 21355387. The reversal of 21355376 is 67355312.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12836 + ... + 14403.

It is an arithmetic number, because the mean of its divisors is an integer number (1604436).

Almost surely, 2^21355376 is an apocalyptic number.

It is an amenable number.

21355376 is an abundant number, since it is smaller than the sum of its proper divisors (26777704).

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

21355376 is a wasteful number, since it uses less digits than its factorization.

21355376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27261 (or 27248 counting only the distinct ones).

The product of its digits is 18900, while the sum is 32.

The square root of 21355376 is about 4621.1877261154. The cubic root of 21355376 is about 277.4399989313.

The spelling of 21355376 in words is "twenty-one million, three hundred fifty-five thousand, three hundred seventy-six".