221120772 has 24 divisors (see below), whose sum is σ = 516607392. Its totient is φ = 73612800.

The previous prime is 221120771. The next prime is 221120777. The reversal of 221120772 is 277021122.

It is not an unprimeable number, because it can be changed into a prime (221120771) 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, 1629 + ... + 21092.

It is an arithmetic number, because the mean of its divisors is an integer number (21525308).

Almost surely, 2^221120772 is an apocalyptic number.

It is an amenable number.

221120772 is an abundant number, since it is smaller than the sum of its proper divisors (295486620).

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

221120772 is a wasteful number, since it uses less digits than its factorization.

221120772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23539 (or 23537 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 221120772 is about 14870.1301944536. The cubic root of 221120772 is about 604.7044723811.

Adding to 221120772 its reverse (277021122), we get a palindrome (498141894).

The spelling of 221120772 in words is "two hundred twenty-one million, one hundred twenty thousand, seven hundred seventy-two".