131003402021 has 4 divisors (see below), whose sum is σ = 131546984844. Its totient is φ = 130459819200.

The previous prime is 131003402009. The next prime is 131003402051. The reversal of 131003402021 is 120204300131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120204300131 = 887 ⋅135517813.

It can be written as a sum of positive squares in 2 ways, for example, as 38108896225 + 92894505796 = 195215^2 + 304786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131003402021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131003402051) 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, 271791050 + ... + 271791531.

It is an arithmetic number, because the mean of its divisors is an integer number (32886746211).

Almost surely, 2^131003402021 is an apocalyptic number.

It is an amenable number.

131003402021 is a deficient number, since it is larger than the sum of its proper divisors (543582823).

131003402021 is an equidigital number, since it uses as much as digits as its factorization.

131003402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543582822.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 131003402021 its reverse (120204300131), we get a palindrome (251207702152).

The spelling of 131003402021 in words is "one hundred thirty-one billion, three million, four hundred two thousand, twenty-one".