100121222121 has 4 divisors (see below), whose sum is σ = 133494962832. Its totient is φ = 66747481412.

The previous prime is 100121222093. The next prime is 100121222141. The reversal of 100121222121 is 121222121001.

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 100121222121 - 2²¹ = 100119124969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100121222121.

It is not an unprimeable number, because it can be changed into a prime (100121222141) 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, 16686870351 + ... + 16686870356.

It is an arithmetic number, because the mean of its divisors is an integer number (33373740708).

Almost surely, 2^100121222121 is an apocalyptic number.

It is an amenable number.

100121222121 is a deficient number, since it is larger than the sum of its proper divisors (33373740711).

100121222121 is an equidigital number, since it uses as much as digits as its factorization.

100121222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33373740710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 100121222121 its reverse (121222121001), we get a palindrome (221343343122).

The spelling of 100121222121 in words is "one hundred billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".