21345054299 has 2 divisors, whose sum is σ = 21345054300. Its totient is φ = 21345054298.

The previous prime is 21345054229. The next prime is 21345054317. The reversal of 21345054299 is 99245054312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21345054299 is a prime.

It is a super-2 number, since 2×21345054299² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21345054229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672527149 + 10672527150.

It is an arithmetic number, because the mean of its divisors is an integer number (10672527150).

Almost surely, 2^21345054299 is an apocalyptic number.

21345054299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21345054299 is an equidigital number, since it uses as much as digits as its factorization.

21345054299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 21345054299 in words is "twenty-one billion, three hundred forty-five million, fifty-four thousand, two hundred ninety-nine".