2131300030021 has 2 divisors, whose sum is σ = 2131300030022. Its totient is φ = 2131300030020.

The previous prime is 2131300030019. The next prime is 2131300030037. The reversal of 2131300030021 is 1200300031312.

It is an a-pointer prime, because the next prime (2131300030037) can be obtained adding 2131300030021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2120256332100 + 11043697921 = 1456110^2 + 105089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131300030021 - 2¹ = 2131300030019 is a prime.

Together with 2131300030019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2131300029977 and 2131300030004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131300030081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065650015010 + 1065650015011.

It is an arithmetic number, because the mean of its divisors is an integer number (1065650015011).

Almost surely, 2^{2131300030021} is an apocalyptic number.

It is an amenable number.

2131300030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131300030021 is an equidigital number, since it uses as much as digits as its factorization.

2131300030021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 2131300030021 its reverse (1200300031312), we get a palindrome (3331600061333).

The spelling of 2131300030021 in words is "two trillion, one hundred thirty-one billion, three hundred million, thirty thousand, twenty-one".