2123644477 has 4 divisors (see below), whose sum is σ = 2123737056. Its totient is φ = 2123551900.

The previous prime is 2123644463. The next prime is 2123644517. The reversal of 2123644477 is 7744463212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123644477 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (2123644447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16602 + ... + 67252.

It is an arithmetic number, because the mean of its divisors is an integer number (530934264).

Almost surely, 2^2123644477 is an apocalyptic number.

It is an amenable number.

2123644477 is a deficient number, since it is larger than the sum of its proper divisors (92579).

2123644477 is an equidigital number, since it uses as much as digits as its factorization.

2123644477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92578.

The product of its digits is 225792, while the sum is 40.

The square root of 2123644477 is about 46083.0172297778. The cubic root of 2123644477 is about 1285.3673700186.

The spelling of 2123644477 in words is "two billion, one hundred twenty-three million, six hundred forty-four thousand, four hundred seventy-seven".