121203453123 has 24 divisors (see below), whose sum is σ = 176213846016. Its totient is φ = 80276223600.

The previous prime is 121203453101. The next prime is 121203453143. The reversal of 121203453123 is 321354302121.

121203453123 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 0 + 345 + 312 + 3 = 666.

It is not a de Polignac number, because 121203453123 - 2²² = 121199258819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121203453143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1308058 + ... + 1397648.

It is an arithmetic number, because the mean of its divisors is an integer number (7342243584).

Almost surely, 2^121203453123 is an apocalyptic number.

121203453123 is a deficient number, since it is larger than the sum of its proper divisors (55010392893).

121203453123 is a wasteful number, since it uses less digits than its factorization.

121203453123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90575 (or 90572 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 121203453123 its reverse (321354302121), we get a palindrome (442557755244).

The spelling of 121203453123 in words is "one hundred twenty-one billion, two hundred three million, four hundred fifty-three thousand, one hundred twenty-three".