1221002197 has 2 divisors, whose sum is σ = 1221002198. Its totient is φ = 1221002196.

The previous prime is 1221002191. The next prime is 1221002201. The reversal of 1221002197 is 7912001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210413681 + 10588516 = 34791^2 + 3254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221002197 - 2²⁷ = 1086784469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501098 + 610501099.

It is an arithmetic number, because the mean of its divisors is an integer number (610501099).

Almost surely, 2^1221002197 is an apocalyptic number.

It is an amenable number.

1221002197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002197 is an equidigital number, since it uses as much as digits as its factorization.

1221002197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 1221002197 is about 34942.8418563803. The cubic root of 1221002197 is about 1068.8222394908.

The spelling of 1221002197 in words is "one billion, two hundred twenty-one million, two thousand, one hundred ninety-seven".