20321541421 has 2 divisors, whose sum is σ = 20321541422. Its totient is φ = 20321541420.

The previous prime is 20321541407. The next prime is 20321541439. The reversal of 20321541421 is 12414512302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13762809225 + 6558732196 = 117315^2 + 80986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321541421 - 2⁹ = 20321540909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24321541421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160770710 + 10160770711.

It is an arithmetic number, because the mean of its divisors is an integer number (10160770711).

Almost surely, 2^20321541421 is an apocalyptic number.

It is an amenable number.

20321541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321541421 is an equidigital number, since it uses as much as digits as its factorization.

20321541421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 20321541421 in words is "twenty billion, three hundred twenty-one million, five hundred forty-one thousand, four hundred twenty-one".