21222120201097 has 2 divisors, whose sum is σ = 21222120201098. Its totient is φ = 21222120201096.

The previous prime is 21222120201083. The next prime is 21222120201109. The reversal of 21222120201097 is 79010202122212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18849238748041 + 2372881453056 = 4341571^2 + 1540416^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222120201097 - 2⁴³ = 12426027178889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222120201497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060100548 + 10611060100549.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060100549).

Almost surely, 2^{21222120201097} is an apocalyptic number.

It is an amenable number.

21222120201097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222120201097 is an equidigital number, since it uses as much as digits as its factorization.

21222120201097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21222120201097 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred one thousand, ninety-seven".