21222223355197 has 4 divisors (see below), whose sum is σ = 21222259049596. Its totient is φ = 21222187660800.

The previous prime is 21222223355129. The next prime is 21222223355243. The reversal of 21222223355197 is 79155332222212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3558603053476 + 17663620301721 = 1886426^2 + 4202811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222223355197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222223355117) 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, 16939998 + ... + 18149599.

It is an arithmetic number, because the mean of its divisors is an integer number (5305564762399).

Almost surely, 2^{21222223355197} is an apocalyptic number.

It is an amenable number.

21222223355197 is a deficient number, since it is larger than the sum of its proper divisors (35694399).

21222223355197 is an equidigital number, since it uses as much as digits as its factorization.

21222223355197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35694398.

The product of its digits is 907200, while the sum is 46.

The spelling of 21222223355197 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, three hundred fifty-five thousand, one hundred ninety-seven".