21344231351 has 2 divisors, whose sum is σ = 21344231352. Its totient is φ = 21344231350.

The previous prime is 21344231303. The next prime is 21344231371. The reversal of 21344231351 is 15313244312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344231351 is a prime.

It is a super-2 number, since 2×21344231351² (a number of 21 digits) contains 22 as substring.

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 (21344231371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672115675 + 10672115676.

It is an arithmetic number, because the mean of its divisors is an integer number (10672115676).

Almost surely, 2^21344231351 is an apocalyptic number.

21344231351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344231351 is an equidigital number, since it uses as much as digits as its factorization.

21344231351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

Adding to 21344231351 its reverse (15313244312), we get a palindrome (36657475663).

The spelling of 21344231351 in words is "twenty-one billion, three hundred forty-four million, two hundred thirty-one thousand, three hundred fifty-one".