121010861 has 2 divisors, whose sum is σ = 121010862. Its totient is φ = 121010860.

The previous prime is 121010849. The next prime is 121010873. The reversal of 121010861 is 168010121.

It is a balanced prime because it is at equal distance from previous prime (121010849) and next prime (121010873).

It can be written as a sum of positive squares in only one way, i.e., 117050761 + 3960100 = 10819^2 + 1990^2 .

It is an emirp because it is prime and its reverse (168010121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121010861 - 2¹⁸ = 120748717 is a prime.

It is a super-2 number, since 2×121010861² = 29287256959922642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121010801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505430 + 60505431.

It is an arithmetic number, because the mean of its divisors is an integer number (60505431).

Almost surely, 2^121010861 is an apocalyptic number.

It is an amenable number.

121010861 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010861 is an equidigital number, since it uses as much as digits as its factorization.

121010861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 121010861 is about 11000.4936707404. The cubic root of 121010861 is about 494.6235426302.

Adding to 121010861 its reverse (168010121), we get a palindrome (289020982).

The spelling of 121010861 in words is "one hundred twenty-one million, ten thousand, eight hundred sixty-one".