22221122021 has 8 divisors (see below), whose sum is σ = 25423451904. Its totient is φ = 19025763120.

The previous prime is 22221121981. The next prime is 22221122071. The reversal of 22221122021 is 12022112222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-22221122021 is a prime.

It is a super-2 number, since 2×22221122021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221122071) 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, 1735910 + ... + 1748663.

It is an arithmetic number, because the mean of its divisors is an integer number (3177931488).

Almost surely, 2^22221122021 is an apocalyptic number.

It is an amenable number.

22221122021 is a deficient number, since it is larger than the sum of its proper divisors (3202329883).

22221122021 is an equidigital number, since it uses as much as digits as its factorization.

22221122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485491.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221122021 its reverse (12022112222), we get a palindrome (34243234243).

The spelling of 22221122021 in words is "twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".