1231421414221 has 2 divisors, whose sum is σ = 1231421414222. Its totient is φ = 1231421414220.

The previous prime is 1231421414219. The next prime is 1231421414257. The reversal of 1231421414221 is 1224141241321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100109397321 + 131312016900 = 1048861^2 + 362370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231421414221 - 2¹ = 1231421414219 is a prime.

It is a super-2 number, since 2×1231421414221² (a number of 25 digits) contains 22 as substring.

Together with 1231421414219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1231421414221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231421414521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615710707110 + 615710707111.

It is an arithmetic number, because the mean of its divisors is an integer number (615710707111).

Almost surely, 2^{1231421414221} is an apocalyptic number.

It is an amenable number.

1231421414221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231421414221 is an equidigital number, since it uses as much as digits as its factorization.

1231421414221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 28.

Adding to 1231421414221 its reverse (1224141241321), we get a palindrome (2455562655542).

The spelling of 1231421414221 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, four hundred fourteen thousand, two hundred twenty-one".