1210221994837 has 2 divisors, whose sum is σ = 1210221994838. Its totient is φ = 1210221994836.

The previous prime is 1210221994811. The next prime is 1210221994907. The reversal of 1210221994837 is 7384991220121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931869731556 + 278352263281 = 965334^2 + 527591^2 .

It is an emirp because it is prime and its reverse (7384991220121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210221994837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210221994537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110997418 + 605110997419.

It is an arithmetic number, because the mean of its divisors is an integer number (605110997419).

Almost surely, 2^{1210221994837} is an apocalyptic number.

It is an amenable number.

1210221994837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210221994837 is an equidigital number, since it uses as much as digits as its factorization.

1210221994837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 1210221994837 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, nine hundred ninety-four thousand, eight hundred thirty-seven".