221661452 has 12 divisors (see below), whose sum is σ = 388759560. Its totient is φ = 110587296.

The previous prime is 221661443. The next prime is 221661491. The reversal of 221661452 is 254166122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58802 + ... + 62457.

It is an arithmetic number, because the mean of its divisors is an integer number (32396630).

Almost surely, 2^221661452 is an apocalyptic number.

It is an amenable number.

221661452 is a deficient number, since it is larger than the sum of its proper divisors (167098108).

221661452 is a wasteful number, since it uses less digits than its factorization.

221661452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121720 (or 121718 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 221661452 is about 14888.2991641087. The cubic root of 221661452 is about 605.1969415530.

The spelling of 221661452 in words is "two hundred twenty-one million, six hundred sixty-one thousand, four hundred fifty-two".