2121283555961 has 8 divisors (see below), whose sum is σ = 2175813203400. Its totient is φ = 2067291146752.

The previous prime is 2121283555957. The next prime is 2121283556023. The reversal of 2121283555961 is 1695553821212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 679543030336 + 1441740525625 = 824344^2 + 1200725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121283555961 - 2² = 2121283555957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121283255961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134301560 + ... + 134317353.

It is an arithmetic number, because the mean of its divisors is an integer number (271976650425).

Almost surely, 2^{2121283555961} is an apocalyptic number.

It is an amenable number.

2121283555961 is a deficient number, since it is larger than the sum of its proper divisors (54529647439).

2121283555961 is a wasteful number, since it uses less digits than its factorization.

2121283555961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268619115.

The product of its digits is 1296000, while the sum is 50.

The spelling of 2121283555961 in words is "two trillion, one hundred twenty-one billion, two hundred eighty-three million, five hundred fifty-five thousand, nine hundred sixty-one".