11215311998 has 16 divisors (see below), whose sum is σ = 18944340480. Its totient is φ = 4933421400.

The previous prime is 11215311983. The next prime is 11215312021. The reversal of 11215311998 is 89911351211.

It is a congruent number.

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, 8221688 + ... + 8223051.

It is an arithmetic number, because the mean of its divisors is an integer number (1184021280).

Almost surely, 2^11215311998 is an apocalyptic number.

11215311998 is a deficient number, since it is larger than the sum of its proper divisors (7729028482).

11215311998 is a wasteful number, since it uses less digits than its factorization.

11215311998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16444783.

The product of its digits is 19440, while the sum is 41.

The spelling of 11215311998 in words is "eleven billion, two hundred fifteen million, three hundred eleven thousand, nine hundred ninety-eight".