221404465780 has 24 divisors (see below), whose sum is σ = 489420398880. Its totient is φ = 83900639520.

The previous prime is 221404465769. The next prime is 221404465781. The reversal of 221404465780 is 87564404122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221404465781) 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, 291321286 + ... + 291322045.

It is an arithmetic number, because the mean of its divisors is an integer number (20392516620).

Almost surely, 2^221404465780 is an apocalyptic number.

221404465780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221404465780 is an abundant number, since it is smaller than the sum of its proper divisors (268015933100).

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

221404465780 is a wasteful number, since it uses less digits than its factorization.

221404465780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582643359 (or 582643357 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 43.

The spelling of 221404465780 in words is "two hundred twenty-one billion, four hundred four million, four hundred sixty-five thousand, seven hundred eighty".