1210200781261 has 4 divisors (see below), whose sum is σ = 1210777344000. Its totient is φ = 1209624218524.

The previous prime is 1210200781247. The next prime is 1210200781327. The reversal of 1210200781261 is 1621870020121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1210200781261 - 2⁷ = 1210200781133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210200781241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288278221 + ... + 288282418.

It is an arithmetic number, because the mean of its divisors is an integer number (302694336000).

Almost surely, 2^{1210200781261} is an apocalyptic number.

It is an amenable number.

1210200781261 is a deficient number, since it is larger than the sum of its proper divisors (576562739).

1210200781261 is an equidigital number, since it uses as much as digits as its factorization.

1210200781261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576562738.

The product of its (nonzero) digits is 2688, while the sum is 31.

The spelling of 1210200781261 in words is "one trillion, two hundred ten billion, two hundred million, seven hundred eighty-one thousand, two hundred sixty-one".