20295991321 has 2 divisors, whose sum is σ = 20295991322. Its totient is φ = 20295991320.

The previous prime is 20295991267. The next prime is 20295991351. The reversal of 20295991321 is 12319959202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295991296 + 25 = 142464^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 20295991321 - 2¹⁹ = 20295467033 is a prime.

It is not a weakly prime, because it can be changed into another prime (20295991351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10147995660 + 10147995661.

It is an arithmetic number, because the mean of its divisors is an integer number (10147995661).

Almost surely, 2^20295991321 is an apocalyptic number.

It is an amenable number.

20295991321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20295991321 is an equidigital number, since it uses as much as digits as its factorization.

20295991321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 20295991321 in words is "twenty billion, two hundred ninety-five million, nine hundred ninety-one thousand, three hundred twenty-one".