221145580 has 12 divisors (see below), whose sum is σ = 464405760. Its totient is φ = 88458224.

The previous prime is 221145553. The next prime is 221145581. The reversal of 221145580 is 85541122.

It is not an unprimeable number, because it can be changed into a prime (221145581) 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, 5528620 + ... + 5528659.

It is an arithmetic number, because the mean of its divisors is an integer number (38700480).

Almost surely, 2^221145580 is an apocalyptic number.

221145580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221145580 is an abundant number, since it is smaller than the sum of its proper divisors (243260180).

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

221145580 is a wasteful number, since it uses less digits than its factorization.

221145580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11057288 (or 11057286 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 221145580 is about 14870.9643264988. The cubic root of 221145580 is about 604.7270858869.

The spelling of 221145580 in words is "two hundred twenty-one million, one hundred forty-five thousand, five hundred eighty".