21355374 has 8 divisors (see below), whose sum is σ = 42710760. Its totient is φ = 7118456.

The previous prime is 21355351. The next prime is 21355387. The reversal of 21355374 is 47355312.

It is a sphenic number, since it is the product of 3 distinct primes.

21355374 is an admirable number.

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, 1779609 + ... + 1779620.

It is an arithmetic number, because the mean of its divisors is an integer number (5338845).

Almost surely, 2^21355374 is an apocalyptic number.

21355374 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21355374 is a wasteful number, since it uses less digits than its factorization.

21355374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559234.

The product of its digits is 12600, while the sum is 30.

The square root of 21355374 is about 4621.1875097209. The cubic root of 21355374 is about 277.4399902702.

The spelling of 21355374 in words is "twenty-one million, three hundred fifty-five thousand, three hundred seventy-four".