21434233321 has 2 divisors, whose sum is σ = 21434233322. Its totient is φ = 21434233320.

The previous prime is 21434233283. The next prime is 21434233333. The reversal of 21434233321 is 12333243412.

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., 17594696025 + 3839537296 = 132645^2 + 61964^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434233321 - 2²⁷ = 21300015593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21434233321.

It is not a weakly prime, because it can be changed into another prime (21434233351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717116660 + 10717116661.

It is an arithmetic number, because the mean of its divisors is an integer number (10717116661).

Almost surely, 2^21434233321 is an apocalyptic number.

It is an amenable number.

21434233321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434233321 is an equidigital number, since it uses as much as digits as its factorization.

21434233321 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 21434233321 its reverse (12333243412), we get a palindrome (33767476733).

The spelling of 21434233321 in words is "twenty-one billion, four hundred thirty-four million, two hundred thirty-three thousand, three hundred twenty-one".