22221042397 has 4 divisors (see below), whose sum is σ = 23528162556. Its totient is φ = 20913922240.

The previous prime is 22221042379. The next prime is 22221042401. The reversal of 22221042397 is 79324012222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18641533156 + 3579509241 = 136534^2 + 59829^2 .

It is not a de Polignac number, because 22221042397 - 2⁷ = 22221042269 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 (22221042377) 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, 653560054 + ... + 653560087.

It is an arithmetic number, because the mean of its divisors is an integer number (5882040639).

Almost surely, 2^22221042397 is an apocalyptic number.

It is an amenable number.

22221042397 is a deficient number, since it is larger than the sum of its proper divisors (1307120159).

22221042397 is a wasteful number, since it uses less digits than its factorization.

22221042397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307120158.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 22221042397 in words is "twenty-two billion, two hundred twenty-one million, forty-two thousand, three hundred ninety-seven".