21126343097 has 2 divisors, whose sum is σ = 21126343098. Its totient is φ = 21126343096.

The previous prime is 21126343093. The next prime is 21126343127. The reversal of 21126343097 is 79034362112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14030639401 + 7095703696 = 118451^2 + 84236^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126343097 - 2² = 21126343093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21126343097.

It is not a weakly prime, because it can be changed into another prime (21126343093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563171548 + 10563171549.

It is an arithmetic number, because the mean of its divisors is an integer number (10563171549).

Almost surely, 2^21126343097 is an apocalyptic number.

It is an amenable number.

21126343097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126343097 is an equidigital number, since it uses as much as digits as its factorization.

21126343097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 21126343097 in words is "twenty-one billion, one hundred twenty-six million, three hundred forty-three thousand, ninety-seven".