21154277753 has 4 divisors (see below), whose sum is σ = 24176317440. Its totient is φ = 18132238068.

The previous prime is 21154277723. The next prime is 21154277759. The reversal of 21154277753 is 35777245112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21154277753 - 2²⁰ = 21153229177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154277759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511019833 + ... + 1511019846.

It is an arithmetic number, because the mean of its divisors is an integer number (6044079360).

Almost surely, 2^21154277753 is an apocalyptic number.

It is an amenable number.

21154277753 is a deficient number, since it is larger than the sum of its proper divisors (3022039687).

21154277753 is an equidigital number, since it uses as much as digits as its factorization.

21154277753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022039686.

The product of its digits is 411600, while the sum is 44.

The spelling of 21154277753 in words is "twenty-one billion, one hundred fifty-four million, two hundred seventy-seven thousand, seven hundred fifty-three".