221221041 has 4 divisors (see below), whose sum is σ = 294961392. Its totient is φ = 147480692.

The previous prime is 221221037. The next prime is 221221067. The reversal of 221221041 is 140122122.

221221041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221221041 - 2² = 221221037 is a prime.

It is a super-2 number, since 2×221221041² = 97877497962247362, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221221041.

It is not an unprimeable number, because it can be changed into a prime (221221081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36870171 + ... + 36870176.

It is an arithmetic number, because the mean of its divisors is an integer number (73740348).

Almost surely, 2^221221041 is an apocalyptic number.

It is an amenable number.

221221041 is a deficient number, since it is larger than the sum of its proper divisors (73740351).

221221041 is an equidigital number, since it uses as much as digits as its factorization.

221221041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740350.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221221041 is about 14873.5013026523. The cubic root of 221221041 is about 604.7958612779.

Adding to 221221041 its reverse (140122122), we get a palindrome (361343163).

The spelling of 221221041 in words is "two hundred twenty-one million, two hundred twenty-one thousand, forty-one".