131121222121 has 4 divisors (see below), whose sum is σ = 134170552912. Its totient is φ = 128071891332.

The previous prime is 131121222103. The next prime is 131121222131. The reversal of 131121222121 is 121222121131.

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 131121222121 - 2¹¹ = 131121220073 is a prime.

It is a super-4 number, since 4×131121222121⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131121222131) 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, 1524665331 + ... + 1524665416.

It is an arithmetic number, because the mean of its divisors is an integer number (33542638228).

Almost surely, 2^131121222121 is an apocalyptic number.

It is an amenable number.

131121222121 is a deficient number, since it is larger than the sum of its proper divisors (3049330791).

131121222121 is an equidigital number, since it uses as much as digits as its factorization.

131121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049330790.

The product of its digits is 96, while the sum is 19.

Adding to 131121222121 its reverse (121222121131), we get a palindrome (252343343252).

The spelling of 131121222121 in words is "one hundred thirty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".