221524305640772 has 12 divisors (see below), whose sum is σ = 388051744526460. Its totient is φ = 110652378633216.

The previous prime is 221524305640741. The next prime is 221524305640787. The reversal of 221524305640772 is 277046503425122.

It can be written as a sum of positive squares in 2 ways, for example, as 152994783239236 + 68529522401536 = 12369106^2 + 8278256^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221524305640772.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27443542253 + ... + 27443550324.

It is an arithmetic number, because the mean of its divisors is an integer number (32337645377205).

Almost surely, 2^{221524305640772} is an apocalyptic number.

It is an amenable number.

221524305640772 is a deficient number, since it is larger than the sum of its proper divisors (166527438885688).

221524305640772 is a wasteful number, since it uses less digits than its factorization.

221524305640772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54887093590 (or 54887093588 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 50.

The spelling of 221524305640772 in words is "two hundred twenty-one trillion, five hundred twenty-four billion, three hundred five million, six hundred forty thousand, seven hundred seventy-two".