131021131019 has 4 divisors (see below), whose sum is σ = 137916980040. Its totient is φ = 124125282000.

The previous prime is 131021130941. The next prime is 131021131027. The reversal of 131021131019 is 910131120131.

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: 910131120131 = 36037 ⋅25255463.

It is a cyclic number.

It is not a de Polignac number, because 131021131019 - 2¹² = 131021126923 is a prime.

It is a super-2 number, since 2×131021131019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021130985 and 131021131003.

It is not an unprimeable number, because it can be changed into a prime (131021131039) 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, 3447924482 + ... + 3447924519.

It is an arithmetic number, because the mean of its divisors is an integer number (34479245010).

Almost surely, 2^131021131019 is an apocalyptic number.

131021131019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131021131019 is a deficient number, since it is larger than the sum of its proper divisors (6895849021).

131021131019 is an equidigital number, since it uses as much as digits as its factorization.

131021131019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895849020.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 131021131019 in words is "one hundred thirty-one billion, twenty-one million, one hundred thirty-one thousand, nineteen".