1210745684921 has 2 divisors, whose sum is σ = 1210745684922. Its totient is φ = 1210745684920.

The previous prime is 1210745684909. The next prime is 1210745684959. The reversal of 1210745684921 is 1294865470121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739882106896 + 470863578025 = 860164^2 + 686195^2 .

It is an emirp because it is prime and its reverse (1294865470121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210745684921 is a prime.

It is a super-2 number, since 2×1210745684921² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1210745684921.

It is not a weakly prime, because it can be changed into another prime (1210745681921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605372842460 + 605372842461.

It is an arithmetic number, because the mean of its divisors is an integer number (605372842461).

Almost surely, 2^{1210745684921} is an apocalyptic number.

It is an amenable number.

1210745684921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210745684921 is an equidigital number, since it uses as much as digits as its factorization.

1210745684921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 1210745684921 in words is "one trillion, two hundred ten billion, seven hundred forty-five million, six hundred eighty-four thousand, nine hundred twenty-one".