21011031222193 has 2 divisors, whose sum is σ = 21011031222194. Its totient is φ = 21011031222192.

The previous prime is 21011031222151. The next prime is 21011031222217. The reversal of 21011031222193 is 39122213011012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17761563515809 + 3249467706384 = 4214447^2 + 1802628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011031222193 - 2¹⁷ = 21011031091121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011031222113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505515611096 + 10505515611097.

It is an arithmetic number, because the mean of its divisors is an integer number (10505515611097).

Almost surely, 2^{21011031222193} is an apocalyptic number.

It is an amenable number.

21011031222193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011031222193 is an equidigital number, since it uses as much as digits as its factorization.

21011031222193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21011031222193 in words is "twenty-one trillion, eleven billion, thirty-one million, two hundred twenty-two thousand, one hundred ninety-three".