2101219997 has 2 divisors, whose sum is σ = 2101219998. Its totient is φ = 2101219996.

The previous prime is 2101219987. The next prime is 2101220003. The reversal of 2101219997 is 7999121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1771652281 + 329567716 = 42091^2 + 18154^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101219997 - 2¹² = 2101215901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101219987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050609998 + 1050609999.

It is an arithmetic number, because the mean of its divisors is an integer number (1050609999).

Almost surely, 2^2101219997 is an apocalyptic number.

It is an amenable number.

2101219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101219997 is an equidigital number, since it uses as much as digits as its factorization.

2101219997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 2101219997 is about 45839.0662753944. The cubic root of 2101219997 is about 1280.8271015425.

The spelling of 2101219997 in words is "two billion, one hundred one million, two hundred nineteen thousand, nine hundred ninety-seven".