220447421 has 2 divisors, whose sum is σ = 220447422. Its totient is φ = 220447420.

The previous prime is 220447399. The next prime is 220447427. The reversal of 220447421 is 124744022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177688900 + 42758521 = 13330^2 + 6539^2 .

It is a cyclic number.

It is not a de Polignac number, because 220447421 - 2¹⁴ = 220431037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220447427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110223710 + 110223711.

It is an arithmetic number, because the mean of its divisors is an integer number (110223711).

Almost surely, 2^220447421 is an apocalyptic number.

It is an amenable number.

220447421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220447421 is an equidigital number, since it uses as much as digits as its factorization.

220447421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 220447421 is about 14847.4718723424. The cubic root of 220447421 is about 604.0900383660.

The spelling of 220447421 in words is "two hundred twenty million, four hundred forty-seven thousand, four hundred twenty-one".