221365552 has 10 divisors (see below), whose sum is σ = 428895788. Its totient is φ = 110682768.

The previous prime is 221365549. The next prime is 221365553. The reversal of 221365552 is 255563122.

It is a happy number.

It is a super-2 number, since 2×221365552² = 98005415224529408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221365553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6917658 + ... + 6917689.

Almost surely, 2^221365552 is an apocalyptic number.

It is an amenable number.

221365552 is a deficient number, since it is larger than the sum of its proper divisors (207530236).

221365552 is a wasteful number, since it uses less digits than its factorization.

221365552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13835355 (or 13835349 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 221365552 is about 14878.3585116101. The cubic root of 221365552 is about 604.9275254122.

The spelling of 221365552 in words is "two hundred twenty-one million, three hundred sixty-five thousand, five hundred fifty-two".