21100103012 has 6 divisors (see below), whose sum is σ = 36925180278. Its totient is φ = 10550051504.

The previous prime is 21100102999. The next prime is 21100103023. The reversal of 21100103012 is 21030100112.

It can be written as a sum of positive squares in only one way, i.e., 17650185316 + 3449917696 = 132854^2 + 58736^2 .

It is a super-2 number, since 2×21100103012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100102984 and 21100103002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637512873 + ... + 2637512880.

It is an arithmetic number, because the mean of its divisors is an integer number (6154196713).

Almost surely, 2^21100103012 is an apocalyptic number.

It is an amenable number.

21100103012 is a deficient number, since it is larger than the sum of its proper divisors (15825077266).

21100103012 is a wasteful number, since it uses less digits than its factorization.

21100103012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275025757 (or 5275025755 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21100103012 its reverse (21030100112), we get a palindrome (42130203124).

The spelling of 21100103012 in words is "twenty-one billion, one hundred million, one hundred three thousand, twelve".