21202231131397 has 2 divisors, whose sum is σ = 21202231131398. Its totient is φ = 21202231131396.

The previous prime is 21202231131373. The next prime is 21202231131449. The reversal of 21202231131397 is 79313113220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21193446005956 + 8785125441 = 4603634^2 + 93729^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202231131397 - 2¹⁹ = 21202230607109 is a prime.

It is a super-2 number, since 2×21202231131397² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202231131307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601115565698 + 10601115565699.

It is an arithmetic number, because the mean of its divisors is an integer number (10601115565699).

Almost surely, 2^{21202231131397} is an apocalyptic number.

It is an amenable number.

21202231131397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202231131397 is an equidigital number, since it uses as much as digits as its factorization.

21202231131397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 21202231131397 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-one million, one hundred thirty-one thousand, three hundred ninety-seven".