22021100021 has 8 divisors (see below), whose sum is σ = 22506956544. Its totient is φ = 21535965360.

The previous prime is 22021099963. The next prime is 22021100053. The reversal of 22021100021 is 12000112022.

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 22021100021 - 2¹⁰ = 22021098997 is a prime.

It is a super-2 number, since 2×22021100021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021099975 and 22021100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021103021) 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, 118550 + ... + 241031.

It is an arithmetic number, because the mean of its divisors is an integer number (2813369568).

Almost surely, 2^22021100021 is an apocalyptic number.

It is an amenable number.

22021100021 is a deficient number, since it is larger than the sum of its proper divisors (485856523).

22021100021 is a wasteful number, since it uses less digits than its factorization.

22021100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360931.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22021100021 its reverse (12000112022), we get a palindrome (34021212043).

The spelling of 22021100021 in words is "twenty-two billion, twenty-one million, one hundred thousand, twenty-one".