221043941 has 2 divisors, whose sum is σ = 221043942. Its totient is φ = 221043940.

The previous prime is 221043937. The next prime is 221043959. The reversal of 221043941 is 149340122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178089025 + 42954916 = 13345^2 + 6554^2 .

It is a cyclic number.

It is not a de Polignac number, because 221043941 - 2² = 221043937 is a prime.

It is a super-2 number, since 2×221043941² = 97720847705622962, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221043941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221033941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521970 + 110521971.

It is an arithmetic number, because the mean of its divisors is an integer number (110521971).

Almost surely, 2^221043941 is an apocalyptic number.

It is an amenable number.

221043941 is a deficient number, since it is larger than the sum of its proper divisors (1).

221043941 is an equidigital number, since it uses as much as digits as its factorization.

221043941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 221043941 is about 14867.5465696261. The cubic root of 221043941 is about 604.6344270526.

The spelling of 221043941 in words is "two hundred twenty-one million, forty-three thousand, nine hundred forty-one".