221453780 has 12 divisors (see below), whose sum is σ = 465052980. Its totient is φ = 88581504.

The previous prime is 221453779. The next prime is 221453789. The reversal of 221453780 is 87354122.

It can be written as a sum of positive squares in 2 ways, for example, as 85451536 + 136002244 = 9244^2 + 11662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221453789) 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, 5536325 + ... + 5536364.

It is an arithmetic number, because the mean of its divisors is an integer number (38754415).

Almost surely, 2^221453780 is an apocalyptic number.

221453780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221453780 is an abundant number, since it is smaller than the sum of its proper divisors (243599200).

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

221453780 is a wasteful number, since it uses less digits than its factorization.

221453780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11072698 (or 11072696 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 221453780 is about 14881.3231938561. The cubic root of 221453780 is about 605.0078818726.

The spelling of 221453780 in words is "two hundred twenty-one million, four hundred fifty-three thousand, seven hundred eighty".