221357472 has 48 divisors (see below), whose sum is σ = 664074432. Its totient is φ = 63244800.

The previous prime is 221357413. The next prime is 221357473. The reversal of 221357472 is 274753122.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (221357473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164029 + ... + 165372.

It is an arithmetic number, because the mean of its divisors is an integer number (13834884).

Almost surely, 2^221357472 is an apocalyptic number.

It is an amenable number.

221357472 is an abundant number, since it is smaller than the sum of its proper divisors (442716960).

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

221357472 is a wasteful number, since it uses less digits than its factorization.

221357472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329421 (or 329413 counting only the distinct ones).

The product of its digits is 23520, while the sum is 33.

The square root of 221357472 is about 14878.0869738014. The cubic root of 221357472 is about 604.9201652277.

It can be divided in two parts, 2213 and 57472, that added together give a triangular number (59685 = T₃₄₅).

The spelling of 221357472 in words is "two hundred twenty-one million, three hundred fifty-seven thousand, four hundred seventy-two".