21432333401 has 2 divisors, whose sum is σ = 21432333402. Its totient is φ = 21432333400.

The previous prime is 21432333359. The next prime is 21432333407. The reversal of 21432333401 is 10433323412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21170541001 + 261792400 = 145501^2 + 16180^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432333401 - 2¹⁴ = 21432317017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21432333407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716166700 + 10716166701.

It is an arithmetic number, because the mean of its divisors is an integer number (10716166701).

Almost surely, 2^21432333401 is an apocalyptic number.

It is an amenable number.

21432333401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432333401 is an equidigital number, since it uses as much as digits as its factorization.

21432333401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21432333401 its reverse (10433323412), we get a palindrome (31865656813).

The spelling of 21432333401 in words is "twenty-one billion, four hundred thirty-two million, three hundred thirty-three thousand, four hundred one".