21012212023321 has 2 divisors, whose sum is σ = 21012212023322. Its totient is φ = 21012212023320.

The previous prime is 21012212023273. The next prime is 21012212023343. The reversal of 21012212023321 is 12332021221012.

It is an a-pointer prime, because the next prime (21012212023343) can be obtained adding 21012212023321 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20266752463321 + 745459560000 = 4501861^2 + 863400^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012212023321 - 2²⁵ = 21012178468889 is a prime.

It is a super-2 number, since 2×21012212023321² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012212023292 and 21012212023301.

It is not a weakly prime, because it can be changed into another prime (21012212023351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506106011660 + 10506106011661.

It is an arithmetic number, because the mean of its divisors is an integer number (10506106011661).

Almost surely, 2^{21012212023321} is an apocalyptic number.

It is an amenable number.

21012212023321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012212023321 is an equidigital number, since it uses as much as digits as its factorization.

21012212023321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21012212023321 its reverse (12332021221012), we get a palindrome (33344233244333).

The spelling of 21012212023321 in words is "twenty-one trillion, twelve billion, two hundred twelve million, twenty-three thousand, three hundred twenty-one".