172162221 has 32 divisors (see below), whose sum is σ = 293941248. Its totient is φ = 87013440.

The previous prime is 172162219. The next prime is 172162229. The reversal of 172162221 is 122261271.

It is not a de Polignac number, because 172162221 - 2¹ = 172162219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172162191 and 172162200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172162229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1525 + ... + 18618.

It is an arithmetic number, because the mean of its divisors is an integer number (9185664).

Almost surely, 2^172162221 is an apocalyptic number.

172162221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172162221 is a deficient number, since it is larger than the sum of its proper divisors (121779027).

172162221 is a wasteful number, since it uses less digits than its factorization.

172162221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20201.

The product of its digits is 672, while the sum is 24.

The square root of 172162221 is about 13121.0602086874. The cubic root of 172162221 is about 556.3045587860.

The spelling of 172162221 in words is "one hundred seventy-two million, one hundred sixty-two thousand, two hundred twenty-one".