221271672 has 16 divisors (see below), whose sum is σ = 553179240. Its totient is φ = 73757216.

The previous prime is 221271667. The next prime is 221271683. The reversal of 221271672 is 276172122.

It is a super-2 number, since 2×221271672² = 97922305659351168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4609803 + ... + 4609850.

Almost surely, 2^221271672 is an apocalyptic number.

It is an amenable number.

221271672 is an abundant number, since it is smaller than the sum of its proper divisors (331907568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221271672 is a wasteful number, since it uses less digits than its factorization.

221271672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9219662 (or 9219658 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 221271672 is about 14875.2032591155. The cubic root of 221271672 is about 604.8419977624.

The spelling of 221271672 in words is "two hundred twenty-one million, two hundred seventy-one thousand, six hundred seventy-two".