22101022021 has 8 divisors (see below), whose sum is σ = 23816487800. Its totient is φ = 20387754432.

The previous prime is 22101022019. The next prime is 22101022087. The reversal of 22101022021 is 12022010122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 359519521 + 21741502500 = 18961^2 + 147450^2 .

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 22101022021 - 2¹ = 22101022019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101021992 and 22101022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101022001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528630 + ... + 568903.

It is an arithmetic number, because the mean of its divisors is an integer number (2977060975).

Almost surely, 2^22101022021 is an apocalyptic number.

It is an amenable number.

22101022021 is a deficient number, since it is larger than the sum of its proper divisors (1715465779).

22101022021 is a wasteful number, since it uses less digits than its factorization.

22101022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099095.

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

Adding to 22101022021 its reverse (12022010122), we get a palindrome (34123032143).

The spelling of 22101022021 in words is "twenty-two billion, one hundred one million, twenty-two thousand, twenty-one".