22001212321 has 12 divisors (see below), whose sum is σ = 24205421716. Its totient is φ = 19982682720.

The previous prime is 22001212319. The next prime is 22001212351. The reversal of 22001212321 is 12321210022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21468110400 + 533101921 = 146520^2 + 23089^2 .

It is not a de Polignac number, because 22001212321 - 2¹ = 22001212319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001212295 and 22001212304.

It is not an unprimeable number, because it can be changed into a prime (22001212351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49075 + ... + 215431.

Almost surely, 2^22001212321 is an apocalyptic number.

It is an amenable number.

22001212321 is a deficient number, since it is larger than the sum of its proper divisors (2204209395).

22001212321 is a wasteful number, since it uses less digits than its factorization.

22001212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167472 (or 167461 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22001212321 its reverse (12321210022), we get a palindrome (34322422343).

The spelling of 22001212321 in words is "twenty-two billion, one million, two hundred twelve thousand, three hundred twenty-one".