21867192867 has 32 divisors (see below), whose sum is σ = 32382558208. Its totient is φ = 13040165376.

The previous prime is 21867192839. The next prime is 21867192869. The reversal of 21867192867 is 76829176812.

It is not a de Polignac number, because 21867192867 - 2¹² = 21867188771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21867192869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161643 + ... + 264315.

It is an arithmetic number, because the mean of its divisors is an integer number (1011954944).

Almost surely, 2^21867192867 is an apocalyptic number.

21867192867 is a deficient number, since it is larger than the sum of its proper divisors (10515365341).

21867192867 is a wasteful number, since it uses less digits than its factorization.

21867192867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102859.

The product of its digits is 4064256, while the sum is 57.

The spelling of 21867192867 in words is "twenty-one billion, eight hundred sixty-seven million, one hundred ninety-two thousand, eight hundred sixty-seven".