2131300001221 has 2 divisors, whose sum is σ = 2131300001222. Its totient is φ = 2131300001220.

The previous prime is 2131300001209. The next prime is 2131300001251. The reversal of 2131300001221 is 1221000031312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1686130817121 + 445169184100 = 1298511^2 + 667210^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131300001221 - 2¹⁵ = 2131299968453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131300001195 and 2131300001204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131300001251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065650000610 + 1065650000611.

It is an arithmetic number, because the mean of its divisors is an integer number (1065650000611).

Almost surely, 2^{2131300001221} is an apocalyptic number.

It is an amenable number.

2131300001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131300001221 is an equidigital number, since it uses as much as digits as its factorization.

2131300001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 2131300001221 its reverse (1221000031312), we get a palindrome (3352300032533).

The spelling of 2131300001221 in words is "two trillion, one hundred thirty-one billion, three hundred million, one thousand, two hundred twenty-one".