2121213197 has 2 divisors, whose sum is σ = 2121213198. Its totient is φ = 2121213196.

The previous prime is 2121213179. The next prime is 2121213239. The reversal of 2121213197 is 7913121212.

Together with previous prime (2121213179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1617165796 + 504047401 = 40214^2 + 22451^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121213197 - 2¹⁴ = 2121196813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121213397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060606598 + 1060606599.

It is an arithmetic number, because the mean of its divisors is an integer number (1060606599).

Almost surely, 2^2121213197 is an apocalyptic number.

It is an amenable number.

2121213197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121213197 is an equidigital number, since it uses as much as digits as its factorization.

2121213197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 2121213197 is about 46056.6303261539. The cubic root of 2121213197 is about 1284.8766599255.

The spelling of 2121213197 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred ninety-seven".