121203121123 has 16 divisors (see below), whose sum is σ = 140540438016. Its totient is φ = 102372943680.

The previous prime is 121203121097. The next prime is 121203121153. The reversal of 121203121123 is 321121302121.

It is not a de Polignac number, because 121203121123 - 2³³ = 112613186531 is a prime.

It is a super-2 number, since 2×121203121123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121203121123.

It is not an unprimeable number, because it can be changed into a prime (121203121153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 929340 + ... + 1051702.

It is an arithmetic number, because the mean of its divisors is an integer number (8783777376).

Almost surely, 2^121203121123 is an apocalyptic number.

121203121123 is a deficient number, since it is larger than the sum of its proper divisors (19337316893).

121203121123 is a wasteful number, since it uses less digits than its factorization.

121203121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124434.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121203121123 its reverse (321121302121), we get a palindrome (442324423244).

The spelling of 121203121123 in words is "one hundred twenty-one billion, two hundred three million, one hundred twenty-one thousand, one hundred twenty-three".