21132121013321 has 2 divisors, whose sum is σ = 21132121013322. Its totient is φ = 21132121013320.

The previous prime is 21132121013291. The next prime is 21132121013329. The reversal of 21132121013321 is 12331012123112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12480075271225 + 8652045742096 = 3532715^2 + 2941436^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132121013321 - 2¹⁴ = 21132120996937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21132121013329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566060506660 + 10566060506661.

It is an arithmetic number, because the mean of its divisors is an integer number (10566060506661).

Almost surely, 2^{21132121013321} is an apocalyptic number.

It is an amenable number.

21132121013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132121013321 is an equidigital number, since it uses as much as digits as its factorization.

21132121013321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21132121013321 its reverse (12331012123112), we get a palindrome (33463133136433).

The spelling of 21132121013321 in words is "twenty-one trillion, one hundred thirty-two billion, one hundred twenty-one million, thirteen thousand, three hundred twenty-one".