221117340 has 24 divisors (see below), whose sum is σ = 619128720. Its totient is φ = 58964608.

The previous prime is 221117339. The next prime is 221117399. The reversal of 221117340 is 43711122.

It is a congruent number.

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, 1842585 + ... + 1842704.

It is an arithmetic number, because the mean of its divisors is an integer number (25797030).

Almost surely, 2^221117340 is an apocalyptic number.

221117340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221117340 is an abundant number, since it is smaller than the sum of its proper divisors (398011380).

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

221117340 is a wasteful number, since it uses less digits than its factorization.

221117340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685301 (or 3685299 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 221117340 is about 14870.0147948817. The cubic root of 221117340 is about 604.7013438397.

Adding to 221117340 its reverse (43711122), we get a palindrome (264828462).

The spelling of 221117340 in words is "two hundred twenty-one million, one hundred seventeen thousand, three hundred forty".