220761221 has 4 divisors (see below), whose sum is σ = 220836000. Its totient is φ = 220686444.

The previous prime is 220761197. The next prime is 220761227. The reversal of 220761221 is 122167022.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-220761221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220761227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32771 + ... + 38928.

It is an arithmetic number, because the mean of its divisors is an integer number (55209000).

Almost surely, 2^220761221 is an apocalyptic number.

It is an amenable number.

220761221 is a deficient number, since it is larger than the sum of its proper divisors (74779).

220761221 is an equidigital number, since it uses as much as digits as its factorization.

220761221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74778.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 220761221 is about 14858.0355700207. The cubic root of 220761221 is about 604.3765368855.

The spelling of 220761221 in words is "two hundred twenty million, seven hundred sixty-one thousand, two hundred twenty-one".