12122100121 has 4 divisors (see below), whose sum is σ = 12835164852. Its totient is φ = 11409035392.

The previous prime is 12122100101. The next prime is 12122100157. The reversal of 12122100121 is 12100122121.

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 5712336400 + 6409763721 = 75580^2 + 80061^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122100121 - 2⁹ = 12122099609 is a prime.

It is a super-2 number, since 2×12122100121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122100101) 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, 356532340 + ... + 356532373.

It is an arithmetic number, because the mean of its divisors is an integer number (3208791213).

Almost surely, 2^12122100121 is an apocalyptic number.

It is an amenable number.

12122100121 is a deficient number, since it is larger than the sum of its proper divisors (713064731).

12122100121 is an equidigital number, since it uses as much as digits as its factorization.

12122100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713064730.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12122100121 its reverse (12100122121), we get a palindrome (24222222242).

The spelling of 12122100121 in words is "twelve billion, one hundred twenty-two million, one hundred thousand, one hundred twenty-one".