11980198021 has 12 divisors (see below), whose sum is σ = 13172506732. Its totient is φ = 10887624000.

The previous prime is 11980198001. The next prime is 11980198039. The reversal of 11980198021 is 12089108911.

It can be written as a sum of positive squares in 2 ways, for example, as 3863989921 + 8116208100 = 62161^2 + 90090^2 .

It is not a de Polignac number, because 11980198021 - 2²⁵ = 11946643589 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11980198001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 414481 + ... + 442441.

Almost surely, 2^11980198021 is an apocalyptic number.

11980198021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11980198021 is a deficient number, since it is larger than the sum of its proper divisors (1192308711).

11980198021 is a wasteful number, since it uses less digits than its factorization.

11980198021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31524 (or 31513 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 40.

The spelling of 11980198021 in words is "eleven billion, nine hundred eighty million, one hundred ninety-eight thousand, twenty-one".