21452145054421 has 8 divisors (see below), whose sum is σ = 21857015922264. Its totient is φ = 21047278387200.

The previous prime is 21452145054397. The next prime is 21452145054479. The reversal of 21452145054421 is 12445054125412.

It can be written as a sum of positive squares in 4 ways, for example, as 1030196580196 + 20421948474225 = 1014986^2 + 4519065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21452145054421 - 2⁷ = 21452145054293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452145054481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10434021 + ... + 12319621.

It is an arithmetic number, because the mean of its divisors is an integer number (2732126990283).

Almost surely, 2^{21452145054421} is an apocalyptic number.

It is an amenable number.

21452145054421 is a deficient number, since it is larger than the sum of its proper divisors (404870867843).

21452145054421 is a wasteful number, since it uses less digits than its factorization.

21452145054421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100311.

The product of its (nonzero) digits is 256000, while the sum is 40.

Adding to 21452145054421 its reverse (12445054125412), we get a palindrome (33897199179833).

The spelling of 21452145054421 in words is "twenty-one trillion, four hundred fifty-two billion, one hundred forty-five million, fifty-four thousand, four hundred twenty-one".