123121105153425 has 18 divisors (see below), whose sum is σ = 220523579452982. Its totient is φ = 65664589415040.

The previous prime is 123121105153363. The next prime is 123121105153433. The reversal of 123121105153425 is 524351501121321.

123121105153425 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 2 + 110 + 5 + 1 + 534 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 8563278510864 + 114557826642561 = 2926308^2 + 10703169^2 .

It is not a de Polignac number, because 123121105153425 - 2²³ = 123121096764817 is a prime.

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 123121105153425.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 273602455672 + ... + 273602456121.

Almost surely, 2^{123121105153425} is an apocalyptic number.

123121105153425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123121105153425 is a deficient number, since it is larger than the sum of its proper divisors (97402474299557).

123121105153425 is a wasteful number, since it uses less digits than its factorization.

123121105153425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547204911809 (or 547204911801 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 123121105153425 its reverse (524351501121321), we get a palindrome (647472606274746).

The spelling of 123121105153425 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, one hundred five million, one hundred fifty-three thousand, four hundred twenty-five".