21321201299 has 2 divisors, whose sum is σ = 21321201300. Its totient is φ = 21321201298.

The previous prime is 21321201289. The next prime is 21321201311. The reversal of 21321201299 is 99210212312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21321201299 - 2⁴ = 21321201283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321201289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660600649 + 10660600650.

It is an arithmetic number, because the mean of its divisors is an integer number (10660600650).

Almost surely, 2^21321201299 is an apocalyptic number.

21321201299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321201299 is an equidigital number, since it uses as much as digits as its factorization.

21321201299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 21321201299 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, two hundred ninety-nine".