20321311249 has 2 divisors, whose sum is σ = 20321311250. Its totient is φ = 20321311248.

The previous prime is 20321311207. The next prime is 20321311277. The reversal of 20321311249 is 94211312302.

It is a happy number.

It is an a-pointer prime, because the next prime (20321311277) can be obtained adding 20321311249 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13592062225 + 6729249024 = 116585^2 + 82032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321311249 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321311289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160655624 + 10160655625.

It is an arithmetic number, because the mean of its divisors is an integer number (10160655625).

Almost surely, 2^20321311249 is an apocalyptic number.

It is an amenable number.

20321311249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321311249 is an equidigital number, since it uses as much as digits as its factorization.

20321311249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 20321311249 in words is "twenty billion, three hundred twenty-one million, three hundred eleven thousand, two hundred forty-nine".