221742980 has 24 divisors (see below), whose sum is σ = 465962112. Its totient is φ = 88639712.

The previous prime is 221742979. The next prime is 221743009. The reversal of 221742980 is 89247122.

221742980 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 self number, because there is not a number n which added to its sum of digits gives 221742980.

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, 42389 + ... + 47331.

It is an arithmetic number, because the mean of its divisors is an integer number (19415088).

Almost surely, 2^221742980 is an apocalyptic number.

221742980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221742980 is an abundant number, since it is smaller than the sum of its proper divisors (244219132).

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

221742980 is a wasteful number, since it uses less digits than its factorization.

221742980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7195 (or 7193 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 221742980 is about 14891.0369014384. The cubic root of 221742980 is about 605.2711304385.

The spelling of 221742980 in words is "two hundred twenty-one million, seven hundred forty-two thousand, nine hundred eighty".