21221222212193 has 2 divisors, whose sum is σ = 21221222212194. Its totient is φ = 21221222212192.

The previous prime is 21221222212189. The next prime is 21221222212217. The reversal of 21221222212193 is 39121222212212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21154958700304 + 66263511889 = 4599452^2 + 257417^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221222212193 - 2² = 21221222212189 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221222218193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610611106096 + 10610611106097.

It is an arithmetic number, because the mean of its divisors is an integer number (10610611106097).

Almost surely, 2^{21221222212193} is an apocalyptic number.

It is an amenable number.

21221222212193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221222212193 is an equidigital number, since it uses as much as digits as its factorization.

21221222212193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The spelling of 21221222212193 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred ninety-three".