221661146 has 16 divisors (see below), whose sum is σ = 380479680. Its totient is φ = 94875360.

The previous prime is 221661137. The next prime is 221661149. The reversal of 221661146 is 641166122.

221661146 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221661149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (23779980).

Almost surely, 2^221661146 is an apocalyptic number.

221661146 is a deficient number, since it is larger than the sum of its proper divisors (158818534).

221661146 is a wasteful number, since it uses less digits than its factorization.

221661146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20389.

The product of its digits is 3456, while the sum is 29.

The square root of 221661146 is about 14888.2888875787. The cubic root of 221661146 is about 605.1966630647.

The spelling of 221661146 in words is "two hundred twenty-one million, six hundred sixty-one thousand, one hundred forty-six".