20321322421 has 2 divisors, whose sum is σ = 20321322422. Its totient is φ = 20321322420.

The previous prime is 20321322401. The next prime is 20321322449. The reversal of 20321322421 is 12422312302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20042064900 + 279257521 = 141570^2 + 16711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321322421 - 2²³ = 20312933813 is a prime.

It is a super-2 number, since 2×20321322421² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321322392 and 20321322401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321322401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160661210 + 10160661211.

It is an arithmetic number, because the mean of its divisors is an integer number (10160661211).

Almost surely, 2^20321322421 is an apocalyptic number.

It is an amenable number.

20321322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321322421 is an equidigital number, since it uses as much as digits as its factorization.

20321322421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20321322421 its reverse (12422312302), we get a palindrome (32743634723).

The spelling of 20321322421 in words is "twenty billion, three hundred twenty-one million, three hundred twenty-two thousand, four hundred twenty-one".