221327540 has 24 divisors (see below), whose sum is σ = 531186432. Its totient is φ = 75883680.

The previous prime is 221327537. The next prime is 221327543. The reversal of 221327540 is 45723122.

It is an interprime number because it is at equal distance from previous prime (221327537) and next prime (221327543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221327543) 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, 790316 + ... + 790595.

It is an arithmetic number, because the mean of its divisors is an integer number (22132768).

Almost surely, 2^221327540 is an apocalyptic number.

221327540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221327540 is an abundant number, since it is smaller than the sum of its proper divisors (309858892).

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

221327540 is a wasteful number, since it uses less digits than its factorization.

221327540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580927 (or 1580925 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 221327540 is about 14877.0810309012. The cubic root of 221327540 is about 604.8928981916.

The spelling of 221327540 in words is "two hundred twenty-one million, three hundred twenty-seven thousand, five hundred forty".