21022021211197 has 2 divisors, whose sum is σ = 21022021211198. Its totient is φ = 21022021211196.

The previous prime is 21022021211189. The next prime is 21022021211203. The reversal of 21022021211197 is 79111212022012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16896983032836 + 4125038178361 = 4110594^2 + 2031019^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022021211197 - 2³ = 21022021211189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022021218197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511010605598 + 10511010605599.

It is an arithmetic number, because the mean of its divisors is an integer number (10511010605599).

Almost surely, 2^{21022021211197} is an apocalyptic number.

It is an amenable number.

21022021211197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022021211197 is an equidigital number, since it uses as much as digits as its factorization.

21022021211197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 21022021211197 in words is "twenty-one trillion, twenty-two billion, twenty-one million, two hundred eleven thousand, one hundred ninety-seven".