131103434021 has 4 divisors (see below), whose sum is σ = 149832496032. Its totient is φ = 112374372012.

The previous prime is 131103433997. The next prime is 131103434027. The reversal of 131103434021 is 120434301131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120434301131 = 73 ⋅1649784947.

It is not a de Polignac number, because 131103434021 - 2¹⁴ = 131103417637 is a prime.

It is a super-2 number, since 2×131103434021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131103434027) 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, 9364530995 + ... + 9364531008.

It is an arithmetic number, because the mean of its divisors is an integer number (37458124008).

Almost surely, 2^131103434021 is an apocalyptic number.

It is an amenable number.

131103434021 is a deficient number, since it is larger than the sum of its proper divisors (18729062011).

131103434021 is an equidigital number, since it uses as much as digits as its factorization.

131103434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18729062010.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 131103434021 its reverse (120434301131), we get a palindrome (251537735152).

The spelling of 131103434021 in words is "one hundred thirty-one billion, one hundred three million, four hundred thirty-four thousand, twenty-one".