20221121197 has 2 divisors, whose sum is σ = 20221121198. Its totient is φ = 20221121196.

The previous prime is 20221121159. The next prime is 20221121231. The reversal of 20221121197 is 79112112202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12627915876 + 7593205321 = 112374^2 + 87139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221121197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221121497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110560598 + 10110560599.

It is an arithmetic number, because the mean of its divisors is an integer number (10110560599).

Almost surely, 2^20221121197 is an apocalyptic number.

It is an amenable number.

20221121197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221121197 is an equidigital number, since it uses as much as digits as its factorization.

20221121197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 20221121197 its reverse (79112112202), we get a palindrome (99333233399).

The spelling of 20221121197 in words is "twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred ninety-seven".