20001221299 has 2 divisors, whose sum is σ = 20001221300. Its totient is φ = 20001221298.

The previous prime is 20001221281. The next prime is 20001221311. The reversal of 20001221299 is 99212210002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001221299 - 2⁷ = 20001221171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001201299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000610649 + 10000610650.

It is an arithmetic number, because the mean of its divisors is an integer number (10000610650).

Almost surely, 2^20001221299 is an apocalyptic number.

20001221299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001221299 is an equidigital number, since it uses as much as digits as its factorization.

20001221299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 20001221299 in words is "twenty billion, one million, two hundred twenty-one thousand, two hundred ninety-nine".