21100323610 has 16 divisors (see below), whose sum is σ = 38138182632. Its totient is φ = 8405107200.

The previous prime is 21100323529. The next prime is 21100323611. The reversal of 21100323610 is 1632300112.

It can be written as a sum of positive squares in 4 ways, for example, as 14422328649 + 6677994961 = 120093^2 + 81719^2 .

It is not an unprimeable number, because it can be changed into a prime (21100323611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4375251 + ... + 4380070.

Almost surely, 2^21100323610 is an apocalyptic number.

21100323610 is a deficient number, since it is larger than the sum of its proper divisors (17037859022).

21100323610 is a wasteful number, since it uses less digits than its factorization.

21100323610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8755569.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21100323610 its reverse (1632300112), we get a palindrome (22732623722).

The spelling of 21100323610 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, six hundred ten".