21011121210212 has 48 divisors (see below), whose sum is σ = 44238013102080. Its totient is φ = 8530045524000.

The previous prime is 21011121210181. The next prime is 21011121210223. The reversal of 21011121210212 is 21201212111012.

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 15 ways as a sum of consecutive naturals, for example, 3980837 + ... + 7607187.

It is an arithmetic number, because the mean of its divisors is an integer number (921625272960).

Almost surely, 2^{21011121210212} is an apocalyptic number.

It is an amenable number.

21011121210212 is an abundant number, since it is smaller than the sum of its proper divisors (23226891891868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011121210212 is a wasteful number, since it uses less digits than its factorization.

21011121210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637272 (or 3637270 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21011121210212 its reverse (21201212111012), we get a palindrome (42212333321224).

The spelling of 21011121210212 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".