121231435240423 has 4 divisors (see below), whose sum is σ = 121290199874208. Its totient is φ = 121172670606640.

The previous prime is 121231435240403. The next prime is 121231435240451. The reversal of 121231435240423 is 324042534132121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121231435240423 - 2²⁵ = 121231401685991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231435240403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29382313798 + ... + 29382317923.

It is an arithmetic number, because the mean of its divisors is an integer number (30322549968552).

Almost surely, 2^{121231435240423} is an apocalyptic number.

121231435240423 is a deficient number, since it is larger than the sum of its proper divisors (58764633785).

121231435240423 is an equidigital number, since it uses as much as digits as its factorization.

121231435240423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58764633784.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 121231435240423 its reverse (324042534132121), we get a palindrome (445273969372544).

The spelling of 121231435240423 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, four hundred thirty-five million, two hundred forty thousand, four hundred twenty-three".