21454452233551 has 2 divisors, whose sum is σ = 21454452233552. Its totient is φ = 21454452233550.

The previous prime is 21454452233479. The next prime is 21454452233569. The reversal of 21454452233551 is 15533225445412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21454452233551 - 2⁴³ = 12658359211343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21454452233581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727226116775 + 10727226116776.

It is an arithmetic number, because the mean of its divisors is an integer number (10727226116776).

Almost surely, 2^{21454452233551} is an apocalyptic number.

21454452233551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454452233551 is an equidigital number, since it uses as much as digits as its factorization.

21454452233551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880000, while the sum is 46.

Adding to 21454452233551 its reverse (15533225445412), we get a palindrome (36987677678963).

The spelling of 21454452233551 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty-two million, two hundred thirty-three thousand, five hundred fifty-one".