21167994198 has 32 divisors (see below), whose sum is σ = 45617918976. Its totient is φ = 6509612448.

The previous prime is 21167994163. The next prime is 21167994233. The reversal of 21167994198 is 89149976112.

It is an interprime number because it is at equal distance from previous prime (21167994163) and next prime (21167994233).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 67761 + ... + 216627.

It is an arithmetic number, because the mean of its divisors is an integer number (1425559968).

Almost surely, 2^21167994198 is an apocalyptic number.

21167994198 is an abundant number, since it is smaller than the sum of its proper divisors (24449924778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21167994198 is a wasteful number, since it uses less digits than its factorization.

21167994198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150708.

The product of its digits is 1959552, while the sum is 57.

The spelling of 21167994198 in words is "twenty-one billion, one hundred sixty-seven million, nine hundred ninety-four thousand, one hundred ninety-eight".