100111222012121 has 4 divisors (see below), whose sum is σ = 100111244926644. Its totient is φ = 100111199097600.

The previous prime is 100111222012117. The next prime is 100111222012129. The reversal of 100111222012121 is 121210222111001.

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 44722856875225 + 55388365136896 = 6687515^2 + 7442336^2 .

It is a cyclic number.

It is not a de Polignac number, because 100111222012121 - 2² = 100111222012117 is a prime.

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 100111222012121.

It is not an unprimeable number, because it can be changed into a prime (100111222012129) 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, 2644220 + ... + 14394941.

It is an arithmetic number, because the mean of its divisors is an integer number (25027811231661).

Almost surely, 2^{100111222012121} is an apocalyptic number.

It is an amenable number.

100111222012121 is a deficient number, since it is larger than the sum of its proper divisors (22914523).

100111222012121 is an equidigital number, since it uses as much as digits as its factorization.

100111222012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22914522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 100111222012121 its reverse (121210222111001), we get a palindrome (221321444123122).

The spelling of 100111222012121 in words is "one hundred trillion, one hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".