172499339021 has 4 divisors (see below), whose sum is σ = 173740341600. Its totient is φ = 171258336444.

The previous prime is 172499339011. The next prime is 172499339029. The reversal of 172499339021 is 120933994271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172499339021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172499339029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620501081 + ... + 620501358.

It is an arithmetic number, because the mean of its divisors is an integer number (43435085400).

Almost surely, 2^172499339021 is an apocalyptic number.

It is an amenable number.

172499339021 is a deficient number, since it is larger than the sum of its proper divisors (1241002579).

172499339021 is a wasteful number, since it uses less digits than its factorization.

172499339021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241002578.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 172499339021 in words is "one hundred seventy-two billion, four hundred ninety-nine million, three hundred thirty-nine thousand, twenty-one".