21234422351 has 2 divisors, whose sum is σ = 21234422352. Its totient is φ = 21234422350.

The previous prime is 21234422323. The next prime is 21234422357. The reversal of 21234422351 is 15322443212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234422351 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234422357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617211175 + 10617211176.

It is an arithmetic number, because the mean of its divisors is an integer number (10617211176).

Almost surely, 2^21234422351 is an apocalyptic number.

21234422351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234422351 is an equidigital number, since it uses as much as digits as its factorization.

21234422351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

Adding to 21234422351 its reverse (15322443212), we get a palindrome (36556865563).

The spelling of 21234422351 in words is "twenty-one billion, two hundred thirty-four million, four hundred twenty-two thousand, three hundred fifty-one".