21163316350164 has 48 divisors (see below), whose sum is σ = 51351322014720. Its totient is φ = 6775521612160.

The previous prime is 21163316350147. The next prime is 21163316350177. The reversal of 21163316350164 is 46105361336112.

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, 159132819 + ... + 159265754.

It is an arithmetic number, because the mean of its divisors is an integer number (1069819208640).

Almost surely, 2^{21163316350164} is an apocalyptic number.

It is an amenable number.

21163316350164 is an abundant number, since it is smaller than the sum of its proper divisors (30188005664556).

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

21163316350164 is a wasteful number, since it uses less digits than its factorization.

21163316350164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318398800 (or 318398798 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

Adding to 21163316350164 its reverse (46105361336112), we get a palindrome (67268677686276).

The spelling of 21163316350164 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, three hundred fifty thousand, one hundred sixty-four".