21011210012 has 12 divisors (see below), whose sum is σ = 39598049736. Its totient is φ = 9697481520.

The previous prime is 21011209997. The next prime is 21011210023. The reversal of 21011210012 is 21001211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011209975 and 21011210002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202030814 + ... + 202030917.

It is an arithmetic number, because the mean of its divisors is an integer number (3299837478).

Almost surely, 2^21011210012 is an apocalyptic number.

It is an amenable number.

21011210012 is a deficient number, since it is larger than the sum of its proper divisors (18586839724).

21011210012 is a wasteful number, since it uses less digits than its factorization.

21011210012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404061748 (or 404061746 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011210012 its reverse (21001211012), we get a palindrome (42012421024).

The spelling of 21011210012 in words is "twenty-one billion, eleven million, two hundred ten thousand, twelve".