21402434221033 has 2 divisors, whose sum is σ = 21402434221034. Its totient is φ = 21402434221032.

The previous prime is 21402434221009. The next prime is 21402434221039. The reversal of 21402434221033 is 33012243420412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12648457522089 + 8753976698944 = 3556467^2 + 2958712^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402434221033 - 2⁵ = 21402434221001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21402434220986 and 21402434221004.

It is not a weakly prime, because it can be changed into another prime (21402434221039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701217110516 + 10701217110517.

It is an arithmetic number, because the mean of its divisors is an integer number (10701217110517).

Almost surely, 2^{21402434221033} is an apocalyptic number.

It is an amenable number.

21402434221033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402434221033 is an equidigital number, since it uses as much as digits as its factorization.

21402434221033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21402434221033 its reverse (33012243420412), we get a palindrome (54414677641445).

The spelling of 21402434221033 in words is "twenty-one trillion, four hundred two billion, four hundred thirty-four million, two hundred twenty-one thousand, thirty-three".