2705634921 has 16 divisors (see below), whose sum is σ = 4002174720. Its totient is φ = 1611984720.

The previous prime is 2705634889. The next prime is 2705634959. The reversal of 2705634921 is 1294365072.

It is not a de Polignac number, because 2705634921 - 2⁵ = 2705634889 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2705634921.

It is not an unprimeable number, because it can be changed into a prime (2705634961) 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, 692875 + ... + 696768.

It is an arithmetic number, because the mean of its divisors is an integer number (250135920).

Almost surely, 2^2705634921 is an apocalyptic number.

It is an amenable number.

2705634921 is a deficient number, since it is larger than the sum of its proper divisors (1296539799).

2705634921 is a wasteful number, since it uses less digits than its factorization.

2705634921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389716.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 2705634921 is about 52015.7180186912. The cubic root of 2705634921 is about 1393.4446801668. Note that the first 3 decimals are identical.

Adding to 2705634921 its reverse (1294365072), we get a palindrome (3999999993).

The spelling of 2705634921 in words is "two billion, seven hundred five million, six hundred thirty-four thousand, nine hundred twenty-one".