20623643321 has 2 divisors, whose sum is σ = 20623643322.
Its totient is φ = 20623643320.
The previous prime is 20623643153. The next prime is 20623643329. The reversal of 20623643321 is 12334632602.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 12512659600 + 8110983721 = 111860^2 + 90061^2
It is a cyclic number.
It is not a de Polignac number, because 20623643321 - 210 = 20623642297 is a prime.
It is not a weakly prime, because it can be changed into another prime (20623643329) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311821660 + 10311821661.
It is an arithmetic number, because the mean of its divisors is an integer number (10311821661).
Almost surely, 220623643321 is an apocalyptic number.
It is an amenable number.
20623643321 is a deficient number, since it is larger than the sum of its proper divisors (1).
20623643321 is an equidigital number, since it uses as much as digits as its factorization.
20623643321 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 31104, while the sum is 32.
The spelling of 20623643321 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, three hundred twenty-one".