172466021 has 24 divisors (see below), whose sum is σ = 224694720. Its totient is φ = 129257856.

The previous prime is 172466011. The next prime is 172466033. The reversal of 172466021 is 120664271.

It is not a de Polignac number, because 172466021 - 2¹⁸ = 172203877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172466011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18641 + ... + 26313.

It is an arithmetic number, because the mean of its divisors is an integer number (9362280).

Almost surely, 2^172466021 is an apocalyptic number.

It is an amenable number.

172466021 is a deficient number, since it is larger than the sum of its proper divisors (52228699).

172466021 is a wasteful number, since it uses less digits than its factorization.

172466021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7725 (or 7712 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 172466021 is about 13132.6319144336. The cubic root of 172466021 is about 556.6315875840.

The spelling of 172466021 in words is "one hundred seventy-two million, four hundred sixty-six thousand, twenty-one".