22002021021 has 4 divisors (see below), whose sum is σ = 29336028032. Its totient is φ = 14668014012.

The previous prime is 22002020981. The next prime is 22002021031. The reversal of 22002021021 is 12012020022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22002021021 - 2¹³ = 22002012829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22002020988 and 22002021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002021031) 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 3 ways as a sum of consecutive naturals, for example, 3667003501 + ... + 3667003506.

It is an arithmetic number, because the mean of its divisors is an integer number (7334007008).

Almost surely, 2^22002021021 is an apocalyptic number.

It is an amenable number.

22002021021 is a deficient number, since it is larger than the sum of its proper divisors (7334007011).

22002021021 is an equidigital number, since it uses as much as digits as its factorization.

22002021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334007010.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22002021021 its reverse (12012020022), we get a palindrome (34014041043).

Subtracting from 22002021021 its reverse (12012020022), we obtain a palindrome (9990000999).

The spelling of 22002021021 in words is "twenty-two billion, two million, twenty-one thousand, twenty-one".