21523674 has 8 divisors (see below), whose sum is σ = 43047360. Its totient is φ = 7174556.

The previous prime is 21523669. The next prime is 21523679. The reversal of 21523674 is 47632512.

It is an interprime number because it is at equal distance from previous prime (21523669) and next prime (21523679).

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

21523674 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21523679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793634 + ... + 1793645.

It is an arithmetic number, because the mean of its divisors is an integer number (5380920).

Almost surely, 2^21523674 is an apocalyptic number.

21523674 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.

21523674 is a wasteful number, since it uses less digits than its factorization.

21523674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587284.

The product of its digits is 10080, while the sum is 30.

The square root of 21523674 is about 4639.3613784658. The cubic root of 21523674 is about 278.1669114805.

The spelling of 21523674 in words is "twenty-one million, five hundred twenty-three thousand, six hundred seventy-four".