123121212015012 has 24 divisors (see below), whose sum is σ = 287285368747776. Its totient is φ = 41040041046048.

The previous prime is 123121212014993. The next prime is 123121212015013. The reversal of 123121212015012 is 210510212121321.

It is not an unprimeable number, because it can be changed into a prime (123121212015013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43954708 + ... + 46671819.

It is an arithmetic number, because the mean of its divisors is an integer number (11970223697824).

Almost surely, 2^{123121212015012} is an apocalyptic number.

123121212015012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123121212015012 is an abundant number, since it is smaller than the sum of its proper divisors (164164156732764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123121212015012 is a wasteful number, since it uses less digits than its factorization.

123121212015012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90739747 (or 90739745 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 123121212015012 its reverse (210510212121321), we get a palindrome (333631424136333).

The spelling of 123121212015012 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, two hundred twelve million, fifteen thousand, twelve".