21150220166504 has 256 divisors, whose sum is σ = 50315286067200. Its totient is φ = 8191832140800.

The previous prime is 21150220166477. The next prime is 21150220166519. The reversal of 21150220166504 is 40566102205112.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2047252619 + ... + 2047262949.

It is an arithmetic number, because the mean of its divisors is an integer number (196544086200).

Almost surely, 2^{21150220166504} 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 21150220166504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25157643033600).

21150220166504 is an abundant number, since it is smaller than the sum of its proper divisors (29165065900696).

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

21150220166504 is a wasteful number, since it uses less digits than its factorization.

21150220166504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13096 (or 13092 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21150220166504 in words is "twenty-one trillion, one hundred fifty billion, two hundred twenty million, one hundred sixty-six thousand, five hundred four".