220051421 has 2 divisors, whose sum is σ = 220051422. Its totient is φ = 220051420.

The previous prime is 220051393. The next prime is 220051457. The reversal of 220051421 is 124150022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147136900 + 72914521 = 12130^2 + 8539^2 .

It is a cyclic number.

It is not a de Polignac number, because 220051421 - 2¹⁴ = 220035037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220051421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220051021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110025710 + 110025711.

It is an arithmetic number, because the mean of its divisors is an integer number (110025711).

Almost surely, 2^220051421 is an apocalyptic number.

It is an amenable number.

220051421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220051421 is an equidigital number, since it uses as much as digits as its factorization.

220051421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 220051421 is about 14834.1302744718. The cubic root of 220051421 is about 603.7281031742.

The spelling of 220051421 in words is "two hundred twenty million, fifty-one thousand, four hundred twenty-one".