172721246500420 has 24 divisors (see below), whose sum is σ = 364312479412224. Its totient is φ = 68784143978976.

The previous prime is 172721246500399. The next prime is 172721246500499. The reversal of 172721246500420 is 24005642127271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19022159172 + ... + 19022168251.

It is an arithmetic number, because the mean of its divisors is an integer number (15179686642176).

Almost surely, 2^{172721246500420} is an apocalyptic number.

172721246500420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172721246500420 is an abundant number, since it is smaller than the sum of its proper divisors (191591232911804).

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

172721246500420 is a wasteful number, since it uses less digits than its factorization.

172721246500420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38044327659 (or 38044327657 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 43.

Adding to 172721246500420 its reverse (24005642127271), we get a palindrome (196726888627691).

The spelling of 172721246500420 in words is "one hundred seventy-two trillion, seven hundred twenty-one billion, two hundred forty-six million, five hundred thousand, four hundred twenty".