221545552 has 20 divisors (see below), whose sum is σ = 433185940. Its totient is φ = 109755648.

The previous prime is 221545537. The next prime is 221545559. The reversal of 221545552 is 255545122.

It is a happy number.

221545552 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 168896016 + 52649536 = 12996^2 + 7256^2 .

It is a super-2 number, since 2×221545552² = 98164863221969408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221545559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61773 + ... + 65260.

It is an arithmetic number, because the mean of its divisors is an integer number (21659297).

Almost surely, 2^221545552 is an apocalyptic number.

It is an amenable number.

221545552 is a deficient number, since it is larger than the sum of its proper divisors (211640388).

221545552 is a wasteful number, since it uses less digits than its factorization.

221545552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127150 (or 127144 counting only the distinct ones).

The product of its digits is 20000, while the sum is 31.

The square root of 221545552 is about 14884.4063368345. The cubic root of 221545552 is about 605.0914435010.

The spelling of 221545552 in words is "two hundred twenty-one million, five hundred forty-five thousand, five hundred fifty-two".