21862986991 has 8 divisors (see below), whose sum is σ = 21908068560. Its totient is φ = 21817933248.

The previous prime is 21862986989. The next prime is 21862986997. The reversal of 21862986991 is 19968926812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21862986991 - 2¹ = 21862986989 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 (21862986997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2336875 + ... + 2346211.

It is an arithmetic number, because the mean of its divisors is an integer number (2738508570).

Almost surely, 2^21862986991 is an apocalyptic number.

21862986991 is a deficient number, since it is larger than the sum of its proper divisors (45081569).

21862986991 is an equidigital number, since it uses as much as digits as its factorization.

21862986991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13913.

The product of its digits is 6718464, while the sum is 61.

The spelling of 21862986991 in words is "twenty-one billion, eight hundred sixty-two million, nine hundred eighty-six thousand, nine hundred ninety-one".