21075876863 has 4 divisors (see below), whose sum is σ = 22185133560. Its totient is φ = 19966620168.

The previous prime is 21075876859. The next prime is 21075876883. The reversal of 21075876863 is 36867857012.

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 21075876863 - 2² = 21075876859 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 (21075876823) 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, 554628320 + ... + 554628357.

It is an arithmetic number, because the mean of its divisors is an integer number (5546283390).

Almost surely, 2^21075876863 is an apocalyptic number.

21075876863 is a deficient number, since it is larger than the sum of its proper divisors (1109256697).

21075876863 is a wasteful number, since it uses less digits than its factorization.

21075876863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109256696.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 21075876863 in words is "twenty-one billion, seventy-five million, eight hundred seventy-six thousand, eight hundred sixty-three".