22001222021 has 4 divisors (see below), whose sum is σ = 22088876544. Its totient is φ = 21913567500.

The previous prime is 22001222003. The next prime is 22001222039. The reversal of 22001222021 is 12022210022.

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 an interprime number because it is at equal distance from previous prime (22001222003) and next prime (22001222039).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22001222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001221987 and 22001222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001722021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43826885 + ... + 43827386.

It is an arithmetic number, because the mean of its divisors is an integer number (5522219136).

Almost surely, 2^22001222021 is an apocalyptic number.

It is an amenable number.

22001222021 is a deficient number, since it is larger than the sum of its proper divisors (87654523).

22001222021 is an equidigital number, since it uses as much as digits as its factorization.

22001222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87654522.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22001222021 its reverse (12022210022), we get a palindrome (34023432043).

It can be divided in two parts, 2200 and 1222021, that added together give a palindrome (1224221).

The spelling of 22001222021 in words is "twenty-two billion, one million, two hundred twenty-two thousand, twenty-one".