21130100212 has 24 divisors (see below), whose sum is σ = 40208744576. Its totient is φ = 9657668448.

The previous prime is 21130100191. The next prime is 21130100231. The reversal of 21130100212 is 21200103112.

It is a super-2 number, since 2×21130100212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21130100192 and 21130100201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1967208 + ... + 1977919.

Almost surely, 2^21130100212 is an apocalyptic number.

It is an amenable number.

21130100212 is a deficient number, since it is larger than the sum of its proper divisors (19078644364).

21130100212 is a wasteful number, since it uses less digits than its factorization.

21130100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945247 (or 3945245 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21130100212 its reverse (21200103112), we get a palindrome (42330203324).

The spelling of 21130100212 in words is "twenty-one billion, one hundred thirty million, one hundred thousand, two hundred twelve".