21012101212 has 12 divisors (see below), whose sum is σ = 36772470280. Its totient is φ = 10505681136.

The previous prime is 21012101093. The next prime is 21012101251. The reversal of 21012101212 is 21210121012.

21012101212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21012101192 and 21012101201.

It is a congruent number.

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, 65614 + ... + 215242.

Almost surely, 2^21012101212 is an apocalyptic number.

It is an amenable number.

21012101212 is a deficient number, since it is larger than the sum of its proper divisors (15760369068).

21012101212 is a wasteful number, since it uses less digits than its factorization.

21012101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184740 (or 184738 counting only the distinct ones).

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

Adding to 21012101212 its reverse (21210121012), we get a palindrome (42222222224).

The spelling of 21012101212 in words is "twenty-one billion, twelve million, one hundred one thousand, two hundred twelve".