2102155665227 has 4 divisors (see below), whose sum is σ = 2104133235120. Its totient is φ = 2100178095336.

The previous prime is 2102155665221. The next prime is 2102155665317. The reversal of 2102155665227 is 7225665512012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102155665227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102155665221) 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, 988783352 + ... + 988785477.

It is an arithmetic number, because the mean of its divisors is an integer number (526033308780).

Almost surely, 2^{2102155665227} is an apocalyptic number.

2102155665227 is a deficient number, since it is larger than the sum of its proper divisors (1977569893).

2102155665227 is a wasteful number, since it uses less digits than its factorization.

2102155665227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977569892.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 2102155665227 in words is "two trillion, one hundred two billion, one hundred fifty-five million, six hundred sixty-five thousand, two hundred twenty-seven".