1220443311421 has 2 divisors, whose sum is σ = 1220443311422. Its totient is φ = 1220443311420.

The previous prime is 1220443311379. The next prime is 1220443311463. The reversal of 1220443311421 is 1241133440221.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1220443311379) and next prime (1220443311463).

It can be written as a sum of positive squares in only one way, i.e., 875087282521 + 345356028900 = 935461^2 + 587670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220443311421 - 2¹⁵ = 1220443278653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220443311421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220443311491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610221655710 + 610221655711.

It is an arithmetic number, because the mean of its divisors is an integer number (610221655711).

Almost surely, 2^{1220443311421} is an apocalyptic number.

It is an amenable number.

1220443311421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220443311421 is an equidigital number, since it uses as much as digits as its factorization.

1220443311421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1220443311421 its reverse (1241133440221), we get a palindrome (2461576751642).

The spelling of 1220443311421 in words is "one trillion, two hundred twenty billion, four hundred forty-three million, three hundred eleven thousand, four hundred twenty-one".