21291733970 has 32 divisors (see below), whose sum is σ = 41284503792. Its totient is φ = 7859411712.

The previous prime is 21291733961. The next prime is 21291734021. The reversal of 21291733970 is 7933719212.

It can be written as a sum of positive squares in 8 ways, for example, as 16614952201 + 4676781769 = 128899^2 + 68387^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501284 + ... + 542096.

Almost surely, 2^21291733970 is an apocalyptic number.

21291733970 is a deficient number, since it is larger than the sum of its proper divisors (19992769822).

21291733970 is a wasteful number, since it uses less digits than its factorization.

21291733970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44846.

The product of its (nonzero) digits is 142884, while the sum is 44.

The spelling of 21291733970 in words is "twenty-one billion, two hundred ninety-one million, seven hundred thirty-three thousand, nine hundred seventy".