221287384564 has 12 divisors (see below), whose sum is σ = 387263380644. Its totient is φ = 110640704384.

The previous prime is 221287384529. The next prime is 221287384567. The reversal of 221287384564 is 465483782122.

221287384564 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196985068900 + 24302315664 = 443830^2 + 155892^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221287384567) 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, 575989 + ... + 879964.

It is an arithmetic number, because the mean of its divisors is an integer number (32271948387).

Almost surely, 2^221287384564 is an apocalyptic number.

It is an amenable number.

221287384564 is a deficient number, since it is larger than the sum of its proper divisors (165975996080).

221287384564 is a wasteful number, since it uses less digits than its factorization.

221287384564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493954 (or 1493952 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 52.

The spelling of 221287384564 in words is "two hundred twenty-one billion, two hundred eighty-seven million, three hundred eighty-four thousand, five hundred sixty-four".