103121113212 has 144 divisors (see below), whose sum is σ = 297611496000. Its totient is φ = 29824948224.

The previous prime is 103121113211. The next prime is 103121113237. The reversal of 103121113212 is 212311121301.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103121113211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6539914 + ... + 6555662.

It is an arithmetic number, because the mean of its divisors is an integer number (2066746500).

Almost surely, 2^103121113212 is an apocalyptic number.

103121113212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 103121113212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148805748000).

103121113212 is an abundant number, since it is smaller than the sum of its proper divisors (194490382788).

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

103121113212 is a wasteful number, since it uses less digits than its factorization.

103121113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16612 (or 16607 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 103121113212 its reverse (212311121301), we get a palindrome (315432234513).

The spelling of 103121113212 in words is "one hundred three billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred twelve".