221220232 has 32 divisors (see below), whose sum is σ = 421303680. Its totient is φ = 108882880.

The previous prime is 221220229. The next prime is 221220257. The reversal of 221220232 is 232022122.

221220232 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221220232² = 97876782092267648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285798 + ... + 286570.

It is an arithmetic number, because the mean of its divisors is an integer number (13165740).

Almost surely, 2^221220232 is an apocalyptic number.

It is an amenable number.

221220232 is a deficient number, since it is larger than the sum of its proper divisors (200083448).

221220232 is a wasteful number, since it uses less digits than its factorization.

221220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221220232 is about 14873.4741066101. The cubic root of 221220232 is about 604.7951240357.

Adding to 221220232 its reverse (232022122), we get a palindrome (453242354).

The spelling of 221220232 in words is "two hundred twenty-one million, two hundred twenty thousand, two hundred thirty-two".