20214021197 has 2 divisors, whose sum is σ = 20214021198. Its totient is φ = 20214021196.

The previous prime is 20214021161. The next prime is 20214021209. The reversal of 20214021197 is 79112041202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16110209476 + 4103811721 = 126926^2 + 64061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20214021197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20214021097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107010598 + 10107010599.

It is an arithmetic number, because the mean of its divisors is an integer number (10107010599).

Almost surely, 2^20214021197 is an apocalyptic number.

It is an amenable number.

20214021197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20214021197 is an equidigital number, since it uses as much as digits as its factorization.

20214021197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 20214021197 its reverse (79112041202), we get a palindrome (99326062399).

The spelling of 20214021197 in words is "twenty billion, two hundred fourteen million, twenty-one thousand, one hundred ninety-seven".