131021221021 has 8 divisors (see below), whose sum is σ = 137304573120. Its totient is φ = 124786767072.

The previous prime is 131021221013. The next prime is 131021221043. The reversal of 131021221021 is 120122120131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131021221021 - 2³ = 131021221013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021220986 and 131021221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021221061) 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 7 ways as a sum of consecutive naturals, for example, 12219051 + ... + 12229768.

It is an arithmetic number, because the mean of its divisors is an integer number (17163071640).

Almost surely, 2^131021221021 is an apocalyptic number.

It is an amenable number.

131021221021 is a deficient number, since it is larger than the sum of its proper divisors (6283352099).

131021221021 is a wasteful number, since it uses less digits than its factorization.

131021221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24449075.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 131021221021 its reverse (120122120131), we get a palindrome (251143341152).

The spelling of 131021221021 in words is "one hundred thirty-one billion, twenty-one million, two hundred twenty-one thousand, twenty-one".