2102331561 has 24 divisors (see below), whose sum is σ = 3127125792. Its totient is φ = 1255108800.

The previous prime is 2102331559. The next prime is 2102331563. The reversal of 2102331561 is 1651332012.

2102331561 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2102331559) and next prime (2102331563).

It is not a de Polignac number, because 2102331561 - 2¹ = 2102331559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2102331563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18900 + ... + 67541.

It is an arithmetic number, because the mean of its divisors is an integer number (130296908).

Almost surely, 2^2102331561 is an apocalyptic number.

It is an amenable number.

2102331561 is a deficient number, since it is larger than the sum of its proper divisors (1024794231).

2102331561 is a wasteful number, since it uses less digits than its factorization.

2102331561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86533 (or 86522 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2102331561 is about 45851.1893084574. The cubic root of 2102331561 is about 1281.0529180235.

Adding to 2102331561 its reverse (1651332012), we get a palindrome (3753663573).

The spelling of 2102331561 in words is "two billion, one hundred two million, three hundred thirty-one thousand, five hundred sixty-one".