21529074 has 16 divisors (see below), whose sum is σ = 49209408. Its totient is φ = 6151152.

The previous prime is 21529069. The next prime is 21529091. The reversal of 21529074 is 47092512.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256257 + ... + 256340.

It is an arithmetic number, because the mean of its divisors is an integer number (3075588).

Almost surely, 2^21529074 is an apocalyptic number.

21529074 is an abundant number, since it is smaller than the sum of its proper divisors (27680334).

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

21529074 is a wasteful number, since it uses less digits than its factorization.

21529074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512609.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21529074 is about 4639.9433186193. The cubic root of 21529074 is about 278.1901723129.

The spelling of 21529074 in words is "twenty-one million, five hundred twenty-nine thousand, seventy-four".