21626364464500 has 24 divisors (see below), whose sum is σ = 47231979991560. Its totient is φ = 8650545785600.

The previous prime is 21626364464491. The next prime is 21626364464513. The reversal of 21626364464500 is 546446362612.

It can be written as a sum of positive squares in 4 ways, for example, as 177647076324 + 21448717388176 = 421482^2 + 4631276^2 .

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, 21626363965 + ... + 21626364964.

It is an arithmetic number, because the mean of its divisors is an integer number (1967999166315).

Almost surely, 2^{21626364464500} is an apocalyptic number.

21626364464500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21626364464500 is an abundant number, since it is smaller than the sum of its proper divisors (25605615527060).

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

21626364464500 is a wasteful number, since it uses less digits than its factorization.

21626364464500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43252728948 (or 43252728936 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 21626364464500 in words is "twenty-one trillion, six hundred twenty-six billion, three hundred sixty-four million, four hundred sixty-four thousand, five hundred".