100331012121 has 4 divisors (see below), whose sum is σ = 133774682832. Its totient is φ = 66887341412.

The previous prime is 100331012113. The next prime is 100331012123. The reversal of 100331012121 is 121210133001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100331012121 - 2³ = 100331012113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100331012121.

It is not an unprimeable number, because it can be changed into a prime (100331012123) 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, 16721835351 + ... + 16721835356.

It is an arithmetic number, because the mean of its divisors is an integer number (33443670708).

Almost surely, 2^100331012121 is an apocalyptic number.

It is an amenable number.

100331012121 is a deficient number, since it is larger than the sum of its proper divisors (33443670711).

100331012121 is an equidigital number, since it uses as much as digits as its factorization.

100331012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33443670710.

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

Adding to 100331012121 its reverse (121210133001), we get a palindrome (221541145122).

The spelling of 100331012121 in words is "one hundred billion, three hundred thirty-one million, twelve thousand, one hundred twenty-one".