42020402197 has 2 divisors, whose sum is σ = 42020402198. Its totient is φ = 42020402196.

The previous prime is 42020402191. The next prime is 42020402227. The reversal of 42020402197 is 79120402024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21406908721 + 20613493476 = 146311^2 + 143574^2 .

It is a cyclic number.

It is not a de Polignac number, because 42020402197 - 2³ = 42020402189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42020402191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010201098 + 21010201099.

It is an arithmetic number, because the mean of its divisors is an integer number (21010201099).

Almost surely, 2^42020402197 is an apocalyptic number.

It is an amenable number.

42020402197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020402197 is an equidigital number, since it uses as much as digits as its factorization.

42020402197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 42020402197 in words is "forty-two billion, twenty million, four hundred two thousand, one hundred ninety-seven".