21234323401 has 2 divisors, whose sum is σ = 21234323402. Its totient is φ = 21234323400.

The previous prime is 21234323389. The next prime is 21234323417. The reversal of 21234323401 is 10432343212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17528436025 + 3705887376 = 132395^2 + 60876^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234323401 - 2¹⁹ = 21233799113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234323441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617161700 + 10617161701.

It is an arithmetic number, because the mean of its divisors is an integer number (10617161701).

Almost surely, 2^21234323401 is an apocalyptic number.

It is an amenable number.

21234323401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234323401 is an equidigital number, since it uses as much as digits as its factorization.

21234323401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21234323401 its reverse (10432343212), we get a palindrome (31666666613).

The spelling of 21234323401 in words is "twenty-one billion, two hundred thirty-four million, three hundred twenty-three thousand, four hundred one".