21029074 has 24 divisors (see below), whose sum is σ = 35024220. Its totient is φ = 9461760.

The previous prime is 21029059. The next prime is 21029081. The reversal of 21029074 is 47092012.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 2907025 = 4257^2 + 1705^2 .

It is a congruent 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, 26962 + ... + 27730.

Almost surely, 2^21029074 is an apocalyptic number.

21029074 is a deficient number, since it is larger than the sum of its proper divisors (13995146).

21029074 is a wasteful number, since it uses less digits than its factorization.

21029074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21029074 is about 4585.7468312152. The cubic root of 21029074 is about 276.0196810862.

The spelling of 21029074 in words is "twenty-one million, twenty-nine thousand, seventy-four".