167216221 has 4 divisors (see below), whose sum is σ = 167266912. Its totient is φ = 167165532.

The previous prime is 167216213. The next prime is 167216227. The reversal of 167216221 is 122612761.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122612761 = 157 ⋅780973.

It is a cyclic number.

It is not a de Polignac number, because 167216221 - 2³ = 167216213 is a prime.

It is a super-2 number, since 2×167216221² = 55922529131041682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 167216221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167216227) 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, 20025 + ... + 27118.

It is an arithmetic number, because the mean of its divisors is an integer number (41816728).

Almost surely, 2^167216221 is an apocalyptic number.

It is an amenable number.

167216221 is a deficient number, since it is larger than the sum of its proper divisors (50691).

167216221 is an equidigital number, since it uses as much as digits as its factorization.

167216221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50690.

The product of its digits is 2016, while the sum is 28.

The square root of 167216221 is about 12931.2111188396. The cubic root of 167216221 is about 550.9254073636.

Adding to 167216221 its reverse (122612761), we get a palindrome (289828982).

The spelling of 167216221 in words is "one hundred sixty-seven million, two hundred sixteen thousand, two hundred twenty-one".