221143355252 has 24 divisors (see below), whose sum is σ = 396462804360. Its totient is φ = 107868579840.

The previous prime is 221143355239. The next prime is 221143355269. The reversal of 221143355252 is 252553341122.

It can be written as a sum of positive squares in 4 ways, for example, as 5591151076 + 215552204176 = 74774^2 + 464276^2 .

It is a super-2 number, since 2×221143355252² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4240874 + ... + 4292702.

It is an arithmetic number, because the mean of its divisors is an integer number (16519283515).

Almost surely, 2^221143355252 is an apocalyptic number.

It is an amenable number.

221143355252 is a deficient number, since it is larger than the sum of its proper divisors (175319449108).

221143355252 is a wasteful number, since it uses less digits than its factorization.

221143355252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77891 (or 77889 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

Adding to 221143355252 its reverse (252553341122), we get a palindrome (473696696374).

The spelling of 221143355252 in words is "two hundred twenty-one billion, one hundred forty-three million, three hundred fifty-five thousand, two hundred fifty-two".