131121120021 has 16 divisors (see below), whose sum is σ = 175259895744. Its totient is φ = 87198418944.

The previous prime is 131121120007. The next prime is 131121120029. The reversal of 131121120021 is 120021121131.

It is not a de Polignac number, because 131121120021 - 2⁷ = 131121119893 is a prime.

It is a super-2 number, since 2×131121120021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121120029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2622165 + ... + 2671701.

It is an arithmetic number, because the mean of its divisors is an integer number (10953743484).

Almost surely, 2^131121120021 is an apocalyptic number.

It is an amenable number.

131121120021 is a deficient number, since it is larger than the sum of its proper divisors (44138775723).

131121120021 is a wasteful number, since it uses less digits than its factorization.

131121120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51700.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 131121120021 its reverse (120021121131), we get a palindrome (251142241152).

The spelling of 131121120021 in words is "one hundred thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".