2115120211657 has 16 divisors (see below), whose sum is σ = 2299719577600. Its totient is φ = 1937930501520.

The previous prime is 2115120211639. The next prime is 2115120211681. The reversal of 2115120211657 is 7561120215112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115120211657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115120211637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207093 + ... + 2067154.

It is an arithmetic number, because the mean of its divisors is an integer number (143732473600).

Almost surely, 2^{2115120211657} is an apocalyptic number.

It is an amenable number.

2115120211657 is a deficient number, since it is larger than the sum of its proper divisors (184599365943).

2115120211657 is a wasteful number, since it uses less digits than its factorization.

2115120211657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275876.

The product of its (nonzero) digits is 8400, while the sum is 34.

Adding to 2115120211657 its reverse (7561120215112), we get a palindrome (9676240426769).

The spelling of 2115120211657 in words is "two trillion, one hundred fifteen billion, one hundred twenty million, two hundred eleven thousand, six hundred fifty-seven".