20313221549 has 2 divisors, whose sum is σ = 20313221550. Its totient is φ = 20313221548.

The previous prime is 20313221441. The next prime is 20313221587. The reversal of 20313221549 is 94512231302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19532019049 + 781202500 = 139757^2 + 27950^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313221549 - 2¹² = 20313217453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313241549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156610774 + 10156610775.

It is an arithmetic number, because the mean of its divisors is an integer number (10156610775).

Almost surely, 2^20313221549 is an apocalyptic number.

It is an amenable number.

20313221549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313221549 is an equidigital number, since it uses as much as digits as its factorization.

20313221549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 20313221549 in words is "twenty billion, three hundred thirteen million, two hundred twenty-one thousand, five hundred forty-nine".