21610161610 has 8 divisors (see below), whose sum is σ = 38898290916. Its totient is φ = 8644064640.

The previous prime is 21610161607. The next prime is 21610161611. The reversal of 21610161610 is 1616101612.

It can be written as a sum of positive squares in 2 ways, for example, as 18161066169 + 3449095441 = 134763^2 + 58729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is not an unprimeable number, because it can be changed into a prime (21610161611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080508071 + ... + 1080508090.

Almost surely, 2^21610161610 is an apocalyptic number.

21610161610 is a deficient number, since it is larger than the sum of its proper divisors (17288129306).

21610161610 is a wasteful number, since it uses less digits than its factorization.

21610161610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161016168.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21610161610 in words is "twenty-one billion, six hundred ten million, one hundred sixty-one thousand, six hundred ten".