2121000861617 has 4 divisors (see below), whose sum is σ = 2313819121776. Its totient is φ = 1928182601460.

The previous prime is 2121000861611. The next prime is 2121000861647. The reversal of 2121000861617 is 7161680001212.

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 a de Polignac number, because none of the positive numbers 2^k-2121000861617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121000861611) 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, 96409130063 + ... + 96409130084.

It is an arithmetic number, because the mean of its divisors is an integer number (578454780444).

Almost surely, 2^{2121000861617} is an apocalyptic number.

It is an amenable number.

2121000861617 is a deficient number, since it is larger than the sum of its proper divisors (192818260159).

2121000861617 is a wasteful number, since it uses less digits than its factorization.

2121000861617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192818260158.

The product of its (nonzero) digits is 8064, while the sum is 35.

Adding to 2121000861617 its reverse (7161680001212), we get a palindrome (9282680862829).

The spelling of 2121000861617 in words is "two trillion, one hundred twenty-one billion, eight hundred sixty-one thousand, six hundred seventeen".