22121100021 has 8 divisors (see below), whose sum is σ = 29535373504. Its totient is φ = 14727113280.

The previous prime is 22121100013. The next prime is 22121100031. The reversal of 22121100021 is 12000112122.

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

It is not a de Polignac number, because 22121100021 - 2³ = 22121100013 is a prime.

It is a super-2 number, since 2×22121100021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121100031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5069140 + ... + 5073501.

It is an arithmetic number, because the mean of its divisors is an integer number (3691921688).

Almost surely, 2^22121100021 is an apocalyptic number.

It is an amenable number.

22121100021 is a deficient number, since it is larger than the sum of its proper divisors (7414273483).

22121100021 is a wasteful number, since it uses less digits than its factorization.

22121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10143371.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22121100021 its reverse (12000112122), we get a palindrome (34121212143).

The spelling of 22121100021 in words is "twenty-two billion, one hundred twenty-one million, one hundred thousand, twenty-one".