221141566 has 4 divisors (see below), whose sum is σ = 331712352. Its totient is φ = 110570782.

The previous prime is 221141549. The next prime is 221141581. The reversal of 221141566 is 665141122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665141122 = 2 ⋅332570561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55285390 + ... + 55285393.

It is an arithmetic number, because the mean of its divisors is an integer number (82928088).

Almost surely, 2^221141566 is an apocalyptic number.

221141566 is a deficient number, since it is larger than the sum of its proper divisors (110570786).

221141566 is a wasteful number, since it uses less digits than its factorization.

221141566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110570785.

The product of its digits is 2880, while the sum is 28.

The square root of 221141566 is about 14870.8293649009. The cubic root of 221141566 is about 604.7234270766.

Adding to 221141566 its reverse (665141122), we get a palindrome (886282688).

The spelling of 221141566 in words is "two hundred twenty-one million, one hundred forty-one thousand, five hundred sixty-six".