21000212220112 has 40 divisors (see below), whose sum is σ = 40872242616192. Its totient is φ = 10452588748800.

The previous prime is 21000212219993. The next prime is 21000212220121. The reversal of 21000212220112 is 21102221200012.

It is a happy number.

It is a super-3 number, since 3×21000212220112³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4834537 + ... + 8085367.

Almost surely, 2^{21000212220112} is an apocalyptic number.

It is an amenable number.

21000212220112 is a deficient number, since it is larger than the sum of its proper divisors (19872030396080).

21000212220112 is a wasteful number, since it uses less digits than its factorization.

21000212220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252667 (or 3252661 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21000212220112 its reverse (21102221200012), we get a palindrome (42102433420124).

The spelling of 21000212220112 in words is "twenty-one trillion, two hundred twelve million, two hundred twenty thousand, one hundred twelve".