21691167163248 has 160 divisors (see below), whose sum is σ = 62183918188800. Its totient is φ = 6461640503040.

The previous prime is 21691167163177. The next prime is 21691167163301. The reversal of 21691167163248 is 84236176119612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108340098 + ... + 108540126.

It is an arithmetic number, because the mean of its divisors is an integer number (388649488680).

Almost surely, 2^{21691167163248} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21691167163248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091959094400).

21691167163248 is an abundant number, since it is smaller than the sum of its proper divisors (40492751025552).

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

21691167163248 is an equidigital number, since it uses as much as digits as its factorization.

21691167163248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200228 (or 200104 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The spelling of 21691167163248 in words is "twenty-one trillion, six hundred ninety-one billion, one hundred sixty-seven million, one hundred sixty-three thousand, two hundred forty-eight".