21969990267 has 4 divisors (see below), whose sum is σ = 29293320360. Its totient is φ = 14646660176.

The previous prime is 21969990227. The next prime is 21969990299. The reversal of 21969990267 is 76209996912.

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 21969990267 - 2¹¹ = 21969988219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21969990267.

It is not an unprimeable number, because it can be changed into a prime (21969990227) 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 3 ways as a sum of consecutive naturals, for example, 3661665042 + ... + 3661665047.

It is an arithmetic number, because the mean of its divisors is an integer number (7323330090).

Almost surely, 2^21969990267 is an apocalyptic number.

21969990267 is a deficient number, since it is larger than the sum of its proper divisors (7323330093).

21969990267 is an equidigital number, since it uses as much as digits as its factorization.

21969990267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323330092.

The product of its (nonzero) digits is 6613488, while the sum is 60.

The spelling of 21969990267 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred ninety thousand, two hundred sixty-seven".