2121641660536 has 16 divisors (see below), whose sum is σ = 3978097806240. Its totient is φ = 1060815578880.

The previous prime is 2121641660533. The next prime is 2121641660561. The reversal of 2121641660536 is 6350661461212.

It is a junction number, because it is equal to n+sod(n) for n = 2121641660492 and 2121641660501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121641660533) 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, 1463281 + ... + 2526751.

It is an arithmetic number, because the mean of its divisors is an integer number (248631112890).

Almost surely, 2^{2121641660536} is an apocalyptic number.

It is an amenable number.

2121641660536 is a deficient number, since it is larger than the sum of its proper divisors (1856456145704).

2121641660536 is a wasteful number, since it uses less digits than its factorization.

2121641660536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312854 (or 1312850 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 2121641660536 in words is "two trillion, one hundred twenty-one billion, six hundred forty-one million, six hundred sixty thousand, five hundred thirty-six".