21202231131449 has 2 divisors, whose sum is σ = 21202231131450. Its totient is φ = 21202231131448.

The previous prime is 21202231131397. The next prime is 21202231131527. The reversal of 21202231131449 is 94413113220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14938688803600 + 6263542327849 = 3865060^2 + 2502707^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202231131449 - 2²⁸ = 21201962695993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202231131049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601115565724 + 10601115565725.

It is an arithmetic number, because the mean of its divisors is an integer number (10601115565725).

Almost surely, 2^{21202231131449} is an apocalyptic number.

It is an amenable number.

21202231131449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202231131449 is an equidigital number, since it uses as much as digits as its factorization.

21202231131449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21202231131449 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-one million, one hundred thirty-one thousand, four hundred forty-nine".