22222220021221 has 32 divisors (see below), whose sum is σ = 26426526179328. Its totient is φ = 18457549367040.

The previous prime is 22222220021213. The next prime is 22222220021233. The reversal of 22222220021221 is 12212002222222.

It is a cyclic number.

It is not a de Polignac number, because 22222220021221 - 2³ = 22222220021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222220021192 and 22222220021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222220021821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7166661 + ... + 9788026.

It is an arithmetic number, because the mean of its divisors is an integer number (825828943104).

Almost surely, 2^{22222220021221} is an apocalyptic number.

It is an amenable number.

22222220021221 is a deficient number, since it is larger than the sum of its proper divisors (4204306158107).

22222220021221 is a wasteful number, since it uses less digits than its factorization.

22222220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16954921.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 22222220021221 its reverse (12212002222222), we get a palindrome (34434222243443).

The spelling of 22222220021221 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".