21199892290 has 16 divisors (see below), whose sum is σ = 38380386168. Its totient is φ = 8430939136.

The previous prime is 21199892261. The next prime is 21199892317. The reversal of 21199892290 is 9229899112.

It can be written as a sum of positive squares in 4 ways, for example, as 16509423121 + 4690469169 = 128489^2 + 68487^2 .

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, 6125407 + ... + 6128866.

Almost surely, 2^21199892290 is an apocalyptic number.

21199892290 is a deficient number, since it is larger than the sum of its proper divisors (17180493878).

21199892290 is a wasteful number, since it uses less digits than its factorization.

21199892290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12254453.

The product of its (nonzero) digits is 419904, while the sum is 52.

The spelling of 21199892290 in words is "twenty-one billion, one hundred ninety-nine million, eight hundred ninety-two thousand, two hundred ninety".