21101100004 has 12 divisors (see below), whose sum is σ = 36934512300. Its totient is φ = 10548382208.

The previous prime is 21101099989. The next prime is 21101100061. The reversal of 21101100004 is 40000110112.

It can be written as a sum of positive squares in 2 ways, for example, as 5722619904 + 15378480100 = 75648^2 + 124010^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519949 + ... + 559060.

It is an arithmetic number, because the mean of its divisors is an integer number (3077876025).

Almost surely, 2^21101100004 is an apocalyptic number.

It is an amenable number.

21101100004 is a deficient number, since it is larger than the sum of its proper divisors (15833412296).

21101100004 is a wasteful number, since it uses less digits than its factorization.

21101100004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083902 (or 1083900 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101100004 its reverse (40000110112), we get a palindrome (61101210116).

The spelling of 21101100004 in words is "twenty-one billion, one hundred one million, one hundred thousand, four".