20321322449 has 2 divisors, whose sum is σ = 20321322450. Its totient is φ = 20321322448.

The previous prime is 20321322421. The next prime is 20321322467. The reversal of 20321322449 is 94422312302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12098460049 + 8222862400 = 109993^2 + 90680^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321322449 - 2³² = 16026355153 is a prime.

It is a super-2 number, since 2×20321322449² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321322499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160661224 + 10160661225.

It is an arithmetic number, because the mean of its divisors is an integer number (10160661225).

Almost surely, 2^20321322449 is an apocalyptic number.

It is an amenable number.

20321322449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321322449 is an equidigital number, since it uses as much as digits as its factorization.

20321322449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 20321322449 in words is "twenty billion, three hundred twenty-one million, three hundred twenty-two thousand, four hundred forty-nine".