21212110012 has 48 divisors (see below), whose sum is σ = 38375075200. Its totient is φ = 10253355840.

The previous prime is 21212109967. The next prime is 21212110013. The reversal of 21212110012 is 21001121212.

It is a super-3 number, since 3×21212110012³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21212109974 and 21212110001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212110013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9059962 + ... + 9062302.

Almost surely, 2^21212110012 is an apocalyptic number.

It is an amenable number.

21212110012 is a deficient number, since it is larger than the sum of its proper divisors (17162965188).

21212110012 is a wasteful number, since it uses less digits than its factorization.

21212110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212110012 its reverse (21001121212), we get a palindrome (42213231224).

The spelling of 21212110012 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, twelve".