21234132433 has 2 divisors, whose sum is σ = 21234132434. Its totient is φ = 21234132432.

The previous prime is 21234132431. The next prime is 21234132463. The reversal of 21234132433 is 33423143212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20573025489 + 661106944 = 143433^2 + 25712^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234132433 - 2¹ = 21234132431 is a prime.

Together with 21234132431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21234132431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617066216 + 10617066217.

It is an arithmetic number, because the mean of its divisors is an integer number (10617066217).

Almost surely, 2^21234132433 is an apocalyptic number.

It is an amenable number.

21234132433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234132433 is an equidigital number, since it uses as much as digits as its factorization.

21234132433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 28.

Adding to 21234132433 its reverse (33423143212), we get a palindrome (54657275645).

The spelling of 21234132433 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-two thousand, four hundred thirty-three".