221633689252 has 6 divisors (see below), whose sum is σ = 387858956198. Its totient is φ = 110816844624.

The previous prime is 221633689231. The next prime is 221633689259. The reversal of 221633689252 is 252986336122.

It can be written as a sum of positive squares in only one way, i.e., 166777491456 + 54856197796 = 408384^2 + 234214^2 .

It is a super-2 number, since 2×221633689252² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221633689196 and 221633689205.

It is not an unprimeable number, because it can be changed into a prime (221633689259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27704211153 + ... + 27704211160.

Almost surely, 2^221633689252 is an apocalyptic number.

It is an amenable number.

221633689252 is a deficient number, since it is larger than the sum of its proper divisors (166225266946).

221633689252 is a wasteful number, since it uses less digits than its factorization.

221633689252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55408422317 (or 55408422315 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The spelling of 221633689252 in words is "two hundred twenty-one billion, six hundred thirty-three million, six hundred eighty-nine thousand, two hundred fifty-two".