21485243755 has 16 divisors (see below), whose sum is σ = 25854111360. Its totient is φ = 17140375168.

The previous prime is 21485243729. The next prime is 21485243821. The reversal of 21485243755 is 55734258412.

It is a cyclic number.

It is not a de Polignac number, because 21485243755 - 2⁷ = 21485243627 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 4026069 + ... + 4031401.

It is an arithmetic number, because the mean of its divisors is an integer number (1615881960).

Almost surely, 2^21485243755 is an apocalyptic number.

21485243755 is a deficient number, since it is larger than the sum of its proper divisors (4368867605).

21485243755 is a wasteful number, since it uses less digits than its factorization.

21485243755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7430.

The product of its digits is 1344000, while the sum is 46.

The spelling of 21485243755 in words is "twenty-one billion, four hundred eighty-five million, two hundred forty-three thousand, seven hundred fifty-five".