21074290 has 16 divisors (see below), whose sum is σ = 38060568. Its totient is φ = 8401536.

The previous prime is 21074239. The next prime is 21074311. The reversal of 21074290 is 9247012.

It can be written as a sum of positive squares in 4 ways, for example, as 16916769 + 4157521 = 4113^2 + 2039^2 .

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, 237 + ... + 6496.

Almost surely, 2^21074290 is an apocalyptic number.

21074290 is a deficient number, since it is larger than the sum of its proper divisors (16986278).

21074290 is a wasteful number, since it uses less digits than its factorization.

21074290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7053.

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

The square root of 21074290 is about 4590.6742424180. The cubic root of 21074290 is about 276.2173688449.

The spelling of 21074290 in words is "twenty-one million, seventy-four thousand, two hundred ninety".