22121020021 has 8 divisors (see below), whose sum is σ = 22844853504. Its totient is φ = 21397827360.

The previous prime is 22121020001. The next prime is 22121020027. The reversal of 22121020021 is 12002012122.

It is a happy number.

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 22121020021 - 2²⁹ = 21584149109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121019983 and 22121020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121020027) 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, 89536 + ... + 228601.

It is an arithmetic number, because the mean of its divisors is an integer number (2855606688).

Almost surely, 2^22121020021 is an apocalyptic number.

It is an amenable number.

22121020021 is a deficient number, since it is larger than the sum of its proper divisors (723833483).

22121020021 is a wasteful number, since it uses less digits than its factorization.

22121020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320411.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22121020021 its reverse (12002012122), we get a palindrome (34123032143).

The spelling of 22121020021 in words is "twenty-two billion, one hundred twenty-one million, twenty thousand, twenty-one".