21012110212 has 12 divisors (see below), whose sum is σ = 36781367616. Its totient is φ = 10503148040.

The previous prime is 21012110209. The next prime is 21012110257. The reversal of 21012110212 is 21201121012.

It is a super-2 number, since 2×21012110212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012110192 and 21012110201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710464 + ... + 739447.

It is an arithmetic number, because the mean of its divisors is an integer number (3065113968).

Almost surely, 2^21012110212 is an apocalyptic number.

It is an amenable number.

21012110212 is a deficient number, since it is larger than the sum of its proper divisors (15769257404).

21012110212 is a wasteful number, since it uses less digits than its factorization.

21012110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453538 (or 1453536 counting only the distinct ones).

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

Adding to 21012110212 its reverse (21201121012), we get a palindrome (42213231224).

The spelling of 21012110212 in words is "twenty-one billion, twelve million, one hundred ten thousand, two hundred twelve".