221421120 has 56 divisors (see below), whose sum is σ = 703015104. Its totient is φ = 59045376.

The previous prime is 221421113. The next prime is 221421133. The reversal of 221421120 is 21124122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221421120.

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, 114364 + ... + 116283.

Almost surely, 2^221421120 is an apocalyptic number.

221421120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421120 is an abundant number, since it is smaller than the sum of its proper divisors (481593984).

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

221421120 is a wasteful number, since it uses less digits than its factorization.

221421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230667 (or 230657 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221421120 is about 14880.2258047383. The cubic root of 221421120 is about 604.9781382260.

Adding to 221421120 its reverse (21124122), we get a palindrome (242545242).

The spelling of 221421120 in words is "two hundred twenty-one million, four hundred twenty-one thousand, one hundred twenty".