121289864477 has 4 divisors (see below), whose sum is σ = 123578352540. Its totient is φ = 119001376416.

The previous prime is 121289864471. The next prime is 121289864609. The reversal of 121289864477 is 774468982121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87690607876 + 33599256601 = 296126^2 + 183301^2 .

It is a cyclic number.

It is not a de Polignac number, because 121289864477 - 2⁴ = 121289864461 is a prime.

It is a super-2 number, since 2×121289864477² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121289864471) 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, 1144243952 + ... + 1144244057.

It is an arithmetic number, because the mean of its divisors is an integer number (30894588135).

Almost surely, 2^121289864477 is an apocalyptic number.

It is an amenable number.

121289864477 is a deficient number, since it is larger than the sum of its proper divisors (2288488063).

121289864477 is an equidigital number, since it uses as much as digits as its factorization.

121289864477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288488062.

The product of its digits is 10838016, while the sum is 59.

The spelling of 121289864477 in words is "one hundred twenty-one billion, two hundred eighty-nine million, eight hundred sixty-four thousand, four hundred seventy-seven".