21368986867 has 4 divisors (see below), whose sum is σ = 22058309056. Its totient is φ = 20679664680.

The previous prime is 21368986811. The next prime is 21368986871. The reversal of 21368986867 is 76868986312.

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 21368986867 - 2¹⁵ = 21368954099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21368986799 and 21368986808.

It is not an unprimeable number, because it can be changed into a prime (21368986967) 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, 344661048 + ... + 344661109.

It is an arithmetic number, because the mean of its divisors is an integer number (5514577264).

Almost surely, 2^21368986867 is an apocalyptic number.

21368986867 is a deficient number, since it is larger than the sum of its proper divisors (689322189).

21368986867 is an equidigital number, since it uses as much as digits as its factorization.

21368986867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689322188.

The product of its digits is 41803776, while the sum is 64.

The spelling of 21368986867 in words is "twenty-one billion, three hundred sixty-eight million, nine hundred eighty-six thousand, eight hundred sixty-seven".