221455340 has 12 divisors (see below), whose sum is σ = 465056256. Its totient is φ = 88582128.

The previous prime is 221455321. The next prime is 221455343. The reversal of 221455340 is 43554122.

It is a happy number.

It is a super-2 number, since 2×221455340² = 98084935229031200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221455343) 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, 5536364 + ... + 5536403.

It is an arithmetic number, because the mean of its divisors is an integer number (38754688).

Almost surely, 2^221455340 is an apocalyptic number.

221455340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221455340 is an abundant number, since it is smaller than the sum of its proper divisors (243600916).

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

221455340 is a wasteful number, since it uses less digits than its factorization.

221455340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11072776 (or 11072774 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 221455340 is about 14881.3756084577. The cubic root of 221455340 is about 605.0093025002.

The spelling of 221455340 in words is "two hundred twenty-one million, four hundred fifty-five thousand, three hundred forty".