172121084 has 24 divisors (see below), whose sum is σ = 306004608. Its totient is φ = 84699440.

The previous prime is 172121071. The next prime is 172121093. The reversal of 172121084 is 480121271.

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, 102419 + ... + 104085.

It is an arithmetic number, because the mean of its divisors is an integer number (12750192).

Almost surely, 2^172121084 is an apocalyptic number.

It is an amenable number.

172121084 is a deficient number, since it is larger than the sum of its proper divisors (133883524).

172121084 is a wasteful number, since it uses less digits than its factorization.

172121084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065 (or 2063 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 172121084 is about 13119.4925206732. The cubic root of 172121084 is about 556.2602468508.

The spelling of 172121084 in words is "one hundred seventy-two million, one hundred twenty-one thousand, eighty-four".