21544091299 has 2 divisors, whose sum is σ = 21544091300. Its totient is φ = 21544091298.

The previous prime is 21544091209. The next prime is 21544091321. The reversal of 21544091299 is 99219044512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21544091299 - 2²³ = 21535702691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21544091209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772045649 + 10772045650.

It is an arithmetic number, because the mean of its divisors is an integer number (10772045650).

Almost surely, 2^21544091299 is an apocalyptic number.

21544091299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21544091299 is an equidigital number, since it uses as much as digits as its factorization.

21544091299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 21544091299 in words is "twenty-one billion, five hundred forty-four million, ninety-one thousand, two hundred ninety-nine".