22055015211221 has 2 divisors, whose sum is σ = 22055015211222. Its totient is φ = 22055015211220.

The previous prime is 22055015211217. The next prime is 22055015211241. The reversal of 22055015211221 is 12211251055022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22008624082225 + 46391128996 = 4691335^2 + 215386^2 .

It is a cyclic number.

It is not a de Polignac number, because 22055015211221 - 2² = 22055015211217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22055015211211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11027507605610 + 11027507605611.

It is an arithmetic number, because the mean of its divisors is an integer number (11027507605611).

Almost surely, 2^{22055015211221} is an apocalyptic number.

It is an amenable number.

22055015211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22055015211221 is an equidigital number, since it uses as much as digits as its factorization.

22055015211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 22055015211221 its reverse (12211251055022), we get a palindrome (34266266266243).

The spelling of 22055015211221 in words is "twenty-two trillion, fifty-five billion, fifteen million, two hundred eleven thousand, two hundred twenty-one".