21790959290 has 16 divisors (see below), whose sum is σ = 39225434112. Its totient is φ = 8716004304.

The previous prime is 21790959241. The next prime is 21790959293. The reversal of 21790959290 is 9295909712.

It is not an unprimeable number, because it can be changed into a prime (21790959293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362567 + ... + 418373.

It is an arithmetic number, because the mean of its divisors is an integer number (2451589632).

Almost surely, 2^21790959290 is an apocalyptic number.

21790959290 is a deficient number, since it is larger than the sum of its proper divisors (17434474822).

21790959290 is a wasteful number, since it uses less digits than its factorization.

21790959290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94861.

The product of its (nonzero) digits is 918540, while the sum is 53.

The spelling of 21790959290 in words is "twenty-one billion, seven hundred ninety million, nine hundred fifty-nine thousand, two hundred ninety".