22278421891 has 8 divisors (see below), whose sum is σ = 24702155568. Its totient is φ = 19921092000.

The previous prime is 22278421829. The next prime is 22278421951. The reversal of 22278421891 is 19812487222.

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 22278421891 - 2¹³ = 22278413699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22278421801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16600240 + ... + 16601581.

It is an arithmetic number, because the mean of its divisors is an integer number (3087769446).

Almost surely, 2^22278421891 is an apocalyptic number.

22278421891 is a deficient number, since it is larger than the sum of its proper divisors (2423733677).

22278421891 is a wasteful number, since it uses less digits than its factorization.

22278421891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33201893.

The product of its digits is 258048, while the sum is 46.

The spelling of 22278421891 in words is "twenty-two billion, two hundred seventy-eight million, four hundred twenty-one thousand, eight hundred ninety-one".