123121232013 has 16 divisors (see below), whose sum is σ = 176832222336. Its totient is φ = 75748585920.

The previous prime is 123121232009. The next prime is 123121232029. The reversal of 123121232013 is 310232121321.

It is not a de Polignac number, because 123121232013 - 2² = 123121232009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121232053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217593 + ... + 541838.

It is an arithmetic number, because the mean of its divisors is an integer number (11052013896).

Almost surely, 2^123121232013 is an apocalyptic number.

123121232013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123121232013 is a deficient number, since it is larger than the sum of its proper divisors (53710990323).

123121232013 is a wasteful number, since it uses less digits than its factorization.

123121232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763604.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 123121232013 its reverse (310232121321), we get a palindrome (433353353334).

The spelling of 123121232013 in words is "one hundred twenty-three billion, one hundred twenty-one million, two hundred thirty-two thousand, thirteen".