21854698063 has 4 divisors (see below), whose sum is σ = 23841488808. Its totient is φ = 19867907320.

The previous prime is 21854698057. The next prime is 21854698123. The reversal of 21854698063 is 36089645812.

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

It is a cyclic number.

It is not a de Polignac number, because 21854698063 - 2⁵ = 21854698031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21854698063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854698043) 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 in 3 ways as a sum of consecutive naturals, for example, 993395356 + ... + 993395377.

It is an arithmetic number, because the mean of its divisors is an integer number (5960372202).

Almost surely, 2^21854698063 is an apocalyptic number.

21854698063 is a deficient number, since it is larger than the sum of its proper divisors (1986790745).

21854698063 is a wasteful number, since it uses less digits than its factorization.

21854698063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986790744.

The product of its (nonzero) digits is 2488320, while the sum is 52.

It can be divided in two parts, 21854 and 698063, that added together give a palindrome (719917).

The spelling of 21854698063 in words is "twenty-one billion, eight hundred fifty-four million, six hundred ninety-eight thousand, sixty-three".