21253674 has 32 divisors (see below), whose sum is σ = 45952704. Its totient is φ = 6514560.

The previous prime is 21253667. The next prime is 21253697. The reversal of 21253674 is 47635212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40377 + ... + 40899.

It is an arithmetic number, because the mean of its divisors is an integer number (1436022).

Almost surely, 2^21253674 is an apocalyptic number.

21253674 is an abundant number, since it is smaller than the sum of its proper divisors (24699030).

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

21253674 is a wasteful number, since it uses less digits than its factorization.

21253674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062.

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

The square root of 21253674 is about 4610.1707126743. The cubic root of 21253674 is about 276.9988748233.

Adding to 21253674 its reverse (47635212), we get a palindrome (68888886).

The spelling of 21253674 in words is "twenty-one million, two hundred fifty-three thousand, six hundred seventy-four".