21010113212 has 24 divisors (see below), whose sum is σ = 41043015552. Its totient is φ = 9327956400.

The previous prime is 21010113211. The next prime is 21010113247. The reversal of 21010113212 is 21231101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010113211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5550464 + ... + 5554247.

It is an arithmetic number, because the mean of its divisors is an integer number (1710125648).

Almost surely, 2^21010113212 is an apocalyptic number.

21010113212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010113212 is a deficient number, since it is larger than the sum of its proper divisors (20032902340).

21010113212 is a wasteful number, since it uses less digits than its factorization.

21010113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104769 (or 11104767 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21010113212 its reverse (21231101012), we get a palindrome (42241214224).

The spelling of 21010113212 in words is "twenty-one billion, ten million, one hundred thirteen thousand, two hundred twelve".