20210099197 has 2 divisors, whose sum is σ = 20210099198. Its totient is φ = 20210099196.

The previous prime is 20210099177. The next prime is 20210099233. The reversal of 20210099197 is 79199001202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16810159716 + 3399939481 = 129654^2 + 58309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210099197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210099177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105049598 + 10105049599.

It is an arithmetic number, because the mean of its divisors is an integer number (10105049599).

Almost surely, 2^20210099197 is an apocalyptic number.

It is an amenable number.

20210099197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210099197 is an equidigital number, since it uses as much as digits as its factorization.

20210099197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The spelling of 20210099197 in words is "twenty billion, two hundred ten million, ninety-nine thousand, one hundred ninety-seven".