20211013321 has 2 divisors, whose sum is σ = 20211013322. Its totient is φ = 20211013320.

The previous prime is 20211013313. The next prime is 20211013349. The reversal of 20211013321 is 12331011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10473270921 + 9737742400 = 102339^2 + 98680^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211013321 - 2³ = 20211013313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211013295 and 20211013304.

It is not a weakly prime, because it can be changed into another prime (20211013021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105506660 + 10105506661.

It is an arithmetic number, because the mean of its divisors is an integer number (10105506661).

Almost surely, 2^20211013321 is an apocalyptic number.

It is an amenable number.

20211013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211013321 is an equidigital number, since it uses as much as digits as its factorization.

20211013321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20211013321 its reverse (12331011202), we get a palindrome (32542024523).

The spelling of 20211013321 in words is "twenty billion, two hundred eleven million, thirteen thousand, three hundred twenty-one".