221613163252 has 24 divisors (see below), whose sum is σ = 435814517376. Its totient is φ = 97835911008.

The previous prime is 221613163249. The next prime is 221613163253. The reversal of 221613163252 is 252361316122.

It is a super-2 number, since 2×221613163252² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221613163253) 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, 92646448 + ... + 92648839.

It is an arithmetic number, because the mean of its divisors is an integer number (18158938224).

Almost surely, 2^221613163252 is an apocalyptic number.

It is an amenable number.

221613163252 is a deficient number, since it is larger than the sum of its proper divisors (214201354124).

221613163252 is a wasteful number, since it uses less digits than its factorization.

221613163252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185295327 (or 185295325 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

Adding to 221613163252 its reverse (252361316122), we get a palindrome (473974479374).

The spelling of 221613163252 in words is "two hundred twenty-one billion, six hundred thirteen million, one hundred sixty-three thousand, two hundred fifty-two".