21120220021297 has 2 divisors, whose sum is σ = 21120220021298. Its totient is φ = 21120220021296.

The previous prime is 21120220021129. The next prime is 21120220021301. The reversal of 21120220021297 is 79212002202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17333241749041 + 3786978272256 = 4163321^2 + 1946016^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120220021297 - 2¹⁵ = 21120219988529 is a prime.

It is a super-2 number, since 2×21120220021297² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120220091297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110010648 + 10560110010649.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110010649).

Almost surely, 2^{21120220021297} is an apocalyptic number.

It is an amenable number.

21120220021297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120220021297 is an equidigital number, since it uses as much as digits as its factorization.

21120220021297 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 21120220021297 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, twenty-one thousand, two hundred ninety-seven".