2123610655 has 4 divisors (see below), whose sum is σ = 2548332792. Its totient is φ = 1698888520.

The previous prime is 2123610653. The next prime is 2123610667. The reversal of 2123610655 is 5560163212.

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

It is not a de Polignac number, because 2123610655 - 2¹ = 2123610653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123610653) 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, 212361061 + ... + 212361070.

It is an arithmetic number, because the mean of its divisors is an integer number (637083198).

Almost surely, 2^2123610655 is an apocalyptic number.

2123610655 is a deficient number, since it is larger than the sum of its proper divisors (424722137).

2123610655 is an equidigital number, since it uses as much as digits as its factorization.

2123610655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424722136.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2123610655 is about 46082.6502601576. The cubic root of 2123610655 is about 1285.3605462264.

Adding to 2123610655 its reverse (5560163212), we get a palindrome (7683773867).

The spelling of 2123610655 in words is "two billion, one hundred twenty-three million, six hundred ten thousand, six hundred fifty-five".