21134321403451 has 2 divisors, whose sum is σ = 21134321403452. Its totient is φ = 21134321403450.

The previous prime is 21134321403347. The next prime is 21134321403589. The reversal of 21134321403451 is 15430412343112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21134321403451 - 2¹³ = 21134321395259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21134321403751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567160701725 + 10567160701726.

It is an arithmetic number, because the mean of its divisors is an integer number (10567160701726).

Almost surely, 2^{21134321403451} is an apocalyptic number.

21134321403451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21134321403451 is an equidigital number, since it uses as much as digits as its factorization.

21134321403451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21134321403451 its reverse (15430412343112), we get a palindrome (36564733746563).

The spelling of 21134321403451 in words is "twenty-one trillion, one hundred thirty-four billion, three hundred twenty-one million, four hundred three thousand, four hundred fifty-one".