22220010001221 has 4 divisors (see below), whose sum is σ = 29626680001632. Its totient is φ = 14813340000812.

The previous prime is 22220010001193. The next prime is 22220010001313. The reversal of 22220010001221 is 12210001002222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22220010001221 - 2⁶ = 22220010001157 is a prime.

It is a super-2 number, since 2×22220010001221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22220010001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220010003221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703335000201 + ... + 3703335000206.

It is an arithmetic number, because the mean of its divisors is an integer number (7406670000408).

Almost surely, 2^{22220010001221} is an apocalyptic number.

It is an amenable number.

22220010001221 is a deficient number, since it is larger than the sum of its proper divisors (7406670000411).

22220010001221 is an equidigital number, since it uses as much as digits as its factorization.

22220010001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406670000410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22220010001221 its reverse (12210001002222), we get a palindrome (34430011003443).

The spelling of 22220010001221 in words is "twenty-two trillion, two hundred twenty billion, ten million, one thousand, two hundred twenty-one".