221172167 has 4 divisors (see below), whose sum is σ = 221281440. Its totient is φ = 221062896.

The previous prime is 221172143. The next prime is 221172169. The reversal of 221172167 is 761271122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 761271122 = 2 ⋅380635561.

It is a cyclic number.

It is not a de Polignac number, because 221172167 - 2¹² = 221168071 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 (221172169) 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, 51542 + ... + 55667.

It is an arithmetic number, because the mean of its divisors is an integer number (55320360).

Almost surely, 2^221172167 is an apocalyptic number.

221172167 is a deficient number, since it is larger than the sum of its proper divisors (109273).

221172167 is a wasteful number, since it uses less digits than its factorization.

221172167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109272.

The product of its digits is 2352, while the sum is 29.

The square root of 221172167 is about 14871.8582228315. The cubic root of 221172167 is about 604.7513191465.

The spelling of 221172167 in words is "two hundred twenty-one million, one hundred seventy-two thousand, one hundred sixty-seven".