21234236351 has 2 divisors, whose sum is σ = 21234236352. Its totient is φ = 21234236350.

The previous prime is 21234236333. The next prime is 21234236371. The reversal of 21234236351 is 15363243212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234236351 - 2²² = 21230042047 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 (21234236311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617118175 + 10617118176.

It is an arithmetic number, because the mean of its divisors is an integer number (10617118176).

Almost surely, 2^21234236351 is an apocalyptic number.

21234236351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234236351 is an equidigital number, since it uses as much as digits as its factorization.

21234236351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 32.

Adding to 21234236351 its reverse (15363243212), we get a palindrome (36597479563).

The spelling of 21234236351 in words is "twenty-one billion, two hundred thirty-four million, two hundred thirty-six thousand, three hundred fifty-one".