21855033867 has 16 divisors (see below), whose sum is σ = 30009216512. Its totient is φ = 14137584480.

The previous prime is 21855033857. The next prime is 21855033881. The reversal of 21855033867 is 76833055812.

It is not a de Polignac number, because 21855033867 - 2⁸ = 21855033611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21855033847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227509 + ... + 308982.

It is an arithmetic number, because the mean of its divisors is an integer number (1875576032).

Almost surely, 2^21855033867 is an apocalyptic number.

21855033867 is a deficient number, since it is larger than the sum of its proper divisors (8154182645).

21855033867 is a wasteful number, since it uses less digits than its factorization.

21855033867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536898.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 21855033867 in words is "twenty-one billion, eight hundred fifty-five million, thirty-three thousand, eight hundred sixty-seven".