22440242021 has 8 divisors (see below), whose sum is σ = 23223880920. Its totient is φ = 21657259008.

The previous prime is 22440242017. The next prime is 22440242051. The reversal of 22440242021 is 12024204422.

It can be written as a sum of positive squares in 4 ways, for example, as 6365805796 + 16074436225 = 79786^2 + 126785^2 .

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 22440242021 - 2² = 22440242017 is a prime.

It is a super-2 number, since 2×22440242021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22440242051) 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, 93836 + ... + 231701.

It is an arithmetic number, because the mean of its divisors is an integer number (2902985115).

Almost surely, 2^22440242021 is an apocalyptic number.

It is an amenable number.

22440242021 is a deficient number, since it is larger than the sum of its proper divisors (783638899).

22440242021 is a wasteful number, since it uses less digits than its factorization.

22440242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327943.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 22440242021 its reverse (12024204422), we get a palindrome (34464446443).

The spelling of 22440242021 in words is "twenty-two billion, four hundred forty million, two hundred forty-two thousand, twenty-one".