21334343230451 has 2 divisors, whose sum is σ = 21334343230452. Its totient is φ = 21334343230450.

The previous prime is 21334343230439. The next prime is 21334343230477. The reversal of 21334343230451 is 15403234343312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21334343230451 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21334343230351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667171615225 + 10667171615226.

It is an arithmetic number, because the mean of its divisors is an integer number (10667171615226).

Almost surely, 2^{21334343230451} is an apocalyptic number.

21334343230451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334343230451 is an equidigital number, since it uses as much as digits as its factorization.

21334343230451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 38.

Adding to 21334343230451 its reverse (15403234343312), we get a palindrome (36737577573763).

The spelling of 21334343230451 in words is "twenty-one trillion, three hundred thirty-four billion, three hundred forty-three million, two hundred thirty thousand, four hundred fifty-one".