11217922898 has 54 divisors (see below), whose sum is σ = 21221441829. Its totient is φ = 4432467312.

The previous prime is 11217922847. The next prime is 11217922909. The reversal of 11217922898 is 89822971211.

It can be written as a sum of positive squares in 2 ways, for example, as 9591655969 + 1626266929 = 97937^2 + 40327^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=74893.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 13630115 + ... + 13630937.

Almost surely, 2^11217922898 is an apocalyptic number.

11217922898 is a deficient number, since it is larger than the sum of its proper divisors (10003518931).

11217922898 is an frugal number, since it uses more digits than its factorization.

11217922898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688 (or 845 counting only the distinct ones).

The product of its digits is 290304, while the sum is 50.

Multiplying 11217922898 by its sum of digits (50), we get a square (560896144900 = 748930²).

The spelling of 11217922898 in words is "eleven billion, two hundred seventeen million, nine hundred twenty-two thousand, eight hundred ninety-eight".