21453756083427 has 4 divisors (see below), whose sum is σ = 28605008111240. Its totient is φ = 14302504055616.

The previous prime is 21453756083413. The next prime is 21453756083449. The reversal of 21453756083427 is 72438065735412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21453756083427 - 2⁷ = 21453756083299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21453756083477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575626013902 + ... + 3575626013907.

It is an arithmetic number, because the mean of its divisors is an integer number (7151252027810).

Almost surely, 2^{21453756083427} is an apocalyptic number.

21453756083427 is a deficient number, since it is larger than the sum of its proper divisors (7151252027813).

21453756083427 is an equidigital number, since it uses as much as digits as its factorization.

21453756083427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7151252027812.

The product of its (nonzero) digits is 33868800, while the sum is 57.

The spelling of 21453756083427 in words is "twenty-one trillion, four hundred fifty-three billion, seven hundred fifty-six million, eighty-three thousand, four hundred twenty-seven".