221660043 has 16 divisors (see below), whose sum is σ = 322809600. Its totient is φ = 134174880.

The previous prime is 221660041. The next prime is 221660057. The reversal of 221660043 is 340066122.

221660043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221660043 - 2¹ = 221660041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221659995 and 221660022.

It is not an unprimeable number, because it can be changed into a prime (221660041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26673 + ... + 33981.

It is an arithmetic number, because the mean of its divisors is an integer number (20175600).

Almost surely, 2^221660043 is an apocalyptic number.

221660043 is a deficient number, since it is larger than the sum of its proper divisors (101149557).

221660043 is a wasteful number, since it uses less digits than its factorization.

221660043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 221660043 is about 14888.2518449951. The cubic root of 221660043 is about 605.1956592307.

The spelling of 221660043 in words is "two hundred twenty-one million, six hundred sixty thousand, forty-three".