121555631423 has 2 divisors, whose sum is σ = 121555631424. Its totient is φ = 121555631422.

The previous prime is 121555631399. The next prime is 121555631479. The reversal of 121555631423 is 324136555121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121555631423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121555331423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60777815711 + 60777815712.

It is an arithmetic number, because the mean of its divisors is an integer number (60777815712).

Almost surely, 2^121555631423 is an apocalyptic number.

121555631423 is a deficient number, since it is larger than the sum of its proper divisors (1).

121555631423 is an equidigital number, since it uses as much as digits as its factorization.

121555631423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

The spelling of 121555631423 in words is "one hundred twenty-one billion, five hundred fifty-five million, six hundred thirty-one thousand, four hundred twenty-three".