21529674 has 24 divisors (see below), whose sum is σ = 47787012. Its totient is φ = 7001280.

The previous prime is 21529649. The next prime is 21529681. The reversal of 21529674 is 47692512.

It can be written as a sum of positive squares in 2 ways, for example, as 16040025 + 5489649 = 4005^2 + 2343^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13849 + ... + 15324.

Almost surely, 2^21529674 is an apocalyptic number.

21529674 is an abundant number, since it is smaller than the sum of its proper divisors (26257338).

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

21529674 is a wasteful number, since it uses less digits than its factorization.

21529674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29222 (or 29219 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21529674 is about 4640.0079741311. The cubic root of 21529674 is about 278.1927566097.

The spelling of 21529674 in words is "twenty-one million, five hundred twenty-nine thousand, six hundred seventy-four".