21097910453 has 2 divisors, whose sum is σ = 21097910454. Its totient is φ = 21097910452.

The previous prime is 21097910429. The next prime is 21097910461. The reversal of 21097910453 is 35401979012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17656562884 + 3441347569 = 132878^2 + 58663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21097910453 - 2⁶ = 21097910389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21097910453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21097910423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548955226 + 10548955227.

It is an arithmetic number, because the mean of its divisors is an integer number (10548955227).

Almost surely, 2^21097910453 is an apocalyptic number.

It is an amenable number.

21097910453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097910453 is an equidigital number, since it uses as much as digits as its factorization.

21097910453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 21097910453 in words is "twenty-one billion, ninety-seven million, nine hundred ten thousand, four hundred fifty-three".