1423220242021 has 2 divisors, whose sum is σ = 1423220242022. Its totient is φ = 1423220242020.

The previous prime is 1423220242019. The next prime is 1423220242043. The reversal of 1423220242021 is 1202420223241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1377301752225 + 45918489796 = 1173585^2 + 214286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423220242021 - 2¹ = 1423220242019 is a prime.

Together with 1423220242019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423220242321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711610121010 + 711610121011.

It is an arithmetic number, because the mean of its divisors is an integer number (711610121011).

Almost surely, 2^{1423220242021} is an apocalyptic number.

It is an amenable number.

1423220242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423220242021 is an equidigital number, since it uses as much as digits as its factorization.

1423220242021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 1423220242021 its reverse (1202420223241), we get a palindrome (2625640465262).

The spelling of 1423220242021 in words is "one trillion, four hundred twenty-three billion, two hundred twenty million, two hundred forty-two thousand, twenty-one".