131011210021 has 4 divisors (see below), whose sum is σ = 131015828844. Its totient is φ = 131006591200.

The previous prime is 131011210009. The next prime is 131011210051. The reversal of 131011210021 is 120012110131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120012110131 = 19 ⋅6316426849.

It can be written as a sum of positive squares in 2 ways, for example, as 93505077796 + 37506132225 = 305786^2 + 193665^2 .

It is a cyclic number.

It is not a de Polignac number, because 131011210021 - 2¹³ = 131011201829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131011209983 and 131011210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131011210051) 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, 2266600 + ... + 2323681.

It is an arithmetic number, because the mean of its divisors is an integer number (32753957211).

Almost surely, 2^131011210021 is an apocalyptic number.

It is an amenable number.

131011210021 is a deficient number, since it is larger than the sum of its proper divisors (4618823).

131011210021 is an equidigital number, since it uses as much as digits as its factorization.

131011210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618822.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 131011210021 its reverse (120012110131), we get a palindrome (251023320152).

The spelling of 131011210021 in words is "one hundred thirty-one billion, eleven million, two hundred ten thousand, twenty-one".