221523245252 has 12 divisors (see below), whose sum is σ = 388298090796. Its totient is φ = 110580933600.

The previous prime is 221523245137. The next prime is 221523245347. The reversal of 221523245252 is 252542325122.

It can be written as a sum of positive squares in 2 ways, for example, as 60067147396 + 161456097856 = 245086^2 + 401816^2 .

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, 45169499 + ... + 45174402.

It is an arithmetic number, because the mean of its divisors is an integer number (32358174233).

Almost surely, 2^221523245252 is an apocalyptic number.

It is an amenable number.

221523245252 is a deficient number, since it is larger than the sum of its proper divisors (166774845544).

221523245252 is a wasteful number, since it uses less digits than its factorization.

221523245252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90344518 (or 90344516 counting only the distinct ones).

The product of its digits is 96000, while the sum is 35.

The spelling of 221523245252 in words is "two hundred twenty-one billion, five hundred twenty-three million, two hundred forty-five thousand, two hundred fifty-two".