21131300212 has 24 divisors (see below), whose sum is σ = 40574776032. Its totient is φ = 9549612000.

The previous prime is 21131300191. The next prime is 21131300249. The reversal of 21131300212 is 21200313112.

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 7 ways as a sum of consecutive naturals, for example, 1380414 + ... + 1395637.

It is an arithmetic number, because the mean of its divisors is an integer number (1690615668).

Almost surely, 2^21131300212 is an apocalyptic number.

21131300212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21131300212 is a deficient number, since it is larger than the sum of its proper divisors (19443475820).

21131300212 is a wasteful number, since it uses less digits than its factorization.

21131300212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776239 (or 2776237 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21131300212 its reverse (21200313112), we get a palindrome (42331613324).

The spelling of 21131300212 in words is "twenty-one billion, one hundred thirty-one million, three hundred thousand, two hundred twelve".