100121323121 has 4 divisors (see below), whose sum is σ = 100477627044. Its totient is φ = 99765019200.

The previous prime is 100121323073. The next prime is 100121323147. The reversal of 100121323121 is 121323121001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86398372096 + 13722951025 = 293936^2 + 117145^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121323121 - 2²² = 100117128817 is a prime.

It is a super-3 number, since 3×100121323121³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100121323121.

It is not an unprimeable number, because it can be changed into a prime (100121323721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178151540 + ... + 178152101.

It is an arithmetic number, because the mean of its divisors is an integer number (25119406761).

Almost surely, 2^100121323121 is an apocalyptic number.

It is an amenable number.

100121323121 is a deficient number, since it is larger than the sum of its proper divisors (356303923).

100121323121 is an equidigital number, since it uses as much as digits as its factorization.

100121323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356303922.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 100121323121 its reverse (121323121001), we get a palindrome (221444444122).

The spelling of 100121323121 in words is "one hundred billion, one hundred twenty-one million, three hundred twenty-three thousand, one hundred twenty-one".