22122002021 has 6 divisors (see below), whose sum is σ = 25733757510. Its totient is φ = 18961715976.

The previous prime is 22122001997. The next prime is 22122002027. The reversal of 22122002021 is 12020022122.

It can be written as a sum of positive squares in only one way, i.e., 17879433796 + 4242568225 = 133714^2 + 65135^2 .

It is not a de Polignac number, because 22122002021 - 2¹⁰ = 22122000997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22122001987 and 22122002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122002027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225734666 + ... + 225734763.

It is an arithmetic number, because the mean of its divisors is an integer number (4288959585).

Almost surely, 2^22122002021 is an apocalyptic number.

It is an amenable number.

22122002021 is a deficient number, since it is larger than the sum of its proper divisors (3611755489).

22122002021 is an equidigital number, since it uses as much as digits as its factorization.

22122002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451469443 (or 451469436 counting only the distinct ones).

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

Adding to 22122002021 its reverse (12020022122), we get a palindrome (34142024143).

The spelling of 22122002021 in words is "twenty-two billion, one hundred twenty-two million, two thousand, twenty-one".