21899418890 has 16 divisors (see below), whose sum is σ = 39422171880. Its totient is φ = 8759052480.

The previous prime is 21899418883. The next prime is 21899418907. The reversal of 21899418890 is 9881499812.

It can be written as a sum of positive squares in 4 ways, for example, as 19220217769 + 2679201121 = 138637^2 + 51761^2 .

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, 49520 + ... + 215060.

Almost surely, 2^21899418890 is an apocalyptic number.

21899418890 is a deficient number, since it is larger than the sum of its proper divisors (17522752990).

21899418890 is a wasteful number, since it uses less digits than its factorization.

21899418890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178777.

The product of its (nonzero) digits is 2985984, while the sum is 59.

The spelling of 21899418890 in words is "twenty-one billion, eight hundred ninety-nine million, four hundred eighteen thousand, eight hundred ninety".