21100110010 has 72 divisors (see below), whose sum is σ = 45653234580. Its totient is φ = 7000801920.

The previous prime is 21100109959. The next prime is 21100110013. The reversal of 21100110010 is 1001100112.

It can be written as a sum of positive squares in 2 ways, for example, as 21075199929 + 24910081 = 145173^2 + 4991^2 .

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21100109975 and 21100110002.

It is not an unprimeable number, because it can be changed into a prime (21100110013) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 448486 + ... + 493294.

Almost surely, 2^21100110010 is an apocalyptic number.

21100110010 is an abundant number, since it is smaller than the sum of its proper divisors (24553124570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100110010 is a wasteful number, since it uses less digits than its factorization.

21100110010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44892 (or 44854 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21100110010 its reverse (1001100112), we get a palindrome (22101210122).

The spelling of 21100110010 in words is "twenty-one billion, one hundred million, one hundred ten thousand, ten".