221534980 has 12 divisors (see below), whose sum is σ = 465223500. Its totient is φ = 88613984.

The previous prime is 221534953. The next prime is 221534983. The reversal of 221534980 is 89435122.

It can be written as a sum of positive squares in 2 ways, for example, as 129413376 + 92121604 = 11376^2 + 9598^2 .

It is not an unprimeable number, because it can be changed into a prime (221534983) 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, 5538355 + ... + 5538394.

It is an arithmetic number, because the mean of its divisors is an integer number (38768625).

Almost surely, 2^221534980 is an apocalyptic number.

221534980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221534980 is an abundant number, since it is smaller than the sum of its proper divisors (243688520).

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

221534980 is a wasteful number, since it uses less digits than its factorization.

221534980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076758 (or 11076756 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 221534980 is about 14884.0511958270. The cubic root of 221534980 is about 605.0818185000.

The spelling of 221534980 in words is "two hundred twenty-one million, five hundred thirty-four thousand, nine hundred eighty".