21000212212212 has 72 divisors (see below), whose sum is σ = 53490992274720. Its totient is φ = 6946388055360.

The previous prime is 21000212212193. The next prime is 21000212212241. The reversal of 21000212212212 is 21221221200012.

It is a happy number.

21000212212212 is a `hidden beast` number, since 210 + 0 + 0 + 21 + 221 + 2 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172370214 + ... + 172492002.

It is an arithmetic number, because the mean of its divisors is an integer number (742930448260).

Almost surely, 2^{21000212212212} is an apocalyptic number.

It is an amenable number.

21000212212212 is an abundant number, since it is smaller than the sum of its proper divisors (32490780062508).

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

21000212212212 is a wasteful number, since it uses less digits than its factorization.

21000212212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158493 (or 158488 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21000212212212 its reverse (21221221200012), we get a palindrome (42221433412224).

The spelling of 21000212212212 in words is "twenty-one trillion, two hundred twelve million, two hundred twelve thousand, two hundred twelve".