21212202111998 has 16 divisors (see below), whose sum is σ = 32847698696064. Its totient is φ = 10263031685280.

The previous prime is 21212202111929. The next prime is 21212202112001. The reversal of 21212202111998 is 89911120221212.

It is a Curzon number.

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, 14933165 + ... + 16291832.

It is an arithmetic number, because the mean of its divisors is an integer number (2052981168504).

Almost surely, 2^{21212202111998} is an apocalyptic number.

21212202111998 is a deficient number, since it is larger than the sum of its proper divisors (11635496584066).

21212202111998 is a wasteful number, since it uses less digits than its factorization.

21212202111998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31235987.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 21212202111998 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred eleven thousand, nine hundred ninety-eight".