100121321031 has 16 divisors (see below), whose sum is σ = 137097100800. Its totient is φ = 64962412928.

The previous prime is 100121321011. The next prime is 100121321033. The reversal of 100121321031 is 130123121001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 100121321031 - 2¹⁰ = 100121320007 is a prime.

It is a super-2 number, since 2×100121321031² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100121321031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121321033) 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, 1958226 + ... + 2008703.

It is an arithmetic number, because the mean of its divisors is an integer number (8568568800).

Almost surely, 2^100121321031 is an apocalyptic number.

100121321031 is a deficient number, since it is larger than the sum of its proper divisors (36975779769).

100121321031 is a wasteful number, since it uses less digits than its factorization.

100121321031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967158.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 100121321031 its reverse (130123121001), we get a palindrome (230244442032).

The spelling of 100121321031 in words is "one hundred billion, one hundred twenty-one million, three hundred twenty-one thousand, thirty-one".