22011001221 has 24 divisors (see below), whose sum is σ = 32283492192. Its totient is φ = 13339707920.

The previous prime is 22011001217. The next prime is 22011001241. The reversal of 22011001221 is 12210011022.

It is not a de Polignac number, because 22011001221 - 2² = 22011001217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22011001197 and 22011001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011001211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 460375 + ... + 505931.

It is an arithmetic number, because the mean of its divisors is an integer number (1345145508).

Almost surely, 2^22011001221 is an apocalyptic number.

It is an amenable number.

22011001221 is a deficient number, since it is larger than the sum of its proper divisors (10272490971).

22011001221 is an frugal number, since it uses more digits than its factorization.

22011001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45615 (or 45571 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22011001221 its reverse (12210011022), we get a palindrome (34221012243).

The spelling of 22011001221 in words is "twenty-two billion, eleven million, one thousand, two hundred twenty-one".