423040120421 has 2 divisors, whose sum is σ = 423040120422. Its totient is φ = 423040120420.

The previous prime is 423040120387. The next prime is 423040120427. The reversal of 423040120421 is 124021040324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326760856900 + 96279263521 = 571630^2 + 310289^2 .

It is a cyclic number.

It is not a de Polignac number, because 423040120421 - 2⁶ = 423040120357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423040120427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211520060210 + 211520060211.

It is an arithmetic number, because the mean of its divisors is an integer number (211520060211).

Almost surely, 2^423040120421 is an apocalyptic number.

It is an amenable number.

423040120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

423040120421 is an equidigital number, since it uses as much as digits as its factorization.

423040120421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 423040120421 its reverse (124021040324), we get a palindrome (547061160745).

The spelling of 423040120421 in words is "four hundred twenty-three billion, forty million, one hundred twenty thousand, four hundred twenty-one".