123121321401 has 24 divisors (see below), whose sum is σ = 181543144320. Its totient is φ = 74154889536.

The previous prime is 123121321391. The next prime is 123121321409. The reversal of 123121321401 is 104123121321.

It is not a de Polignac number, because 123121321401 - 2¹³ = 123121313209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123121321409) 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 23 ways as a sum of consecutive naturals, for example, 2559606 + ... + 2607263.

It is an arithmetic number, because the mean of its divisors is an integer number (7564297680).

Almost surely, 2^123121321401 is an apocalyptic number.

It is an amenable number.

123121321401 is a deficient number, since it is larger than the sum of its proper divisors (58421822919).

123121321401 is a wasteful number, since it uses less digits than its factorization.

123121321401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166945 (or 5166932 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 123121321401 its reverse (104123121321), we get a palindrome (227244442722).

The spelling of 123121321401 in words is "one hundred twenty-three billion, one hundred twenty-one million, three hundred twenty-one thousand, four hundred one".