21215520005112 has 48 divisors (see below), whose sum is σ = 57470774634000. Its totient is φ = 7070353894656.

The previous prime is 21215520005093. The next prime is 21215520005117. The reversal of 21215520005112 is 21150002551212.

21215520005112 is a `hidden beast` number, since 2 + 1 + 21 + 5 + 520 + 0 + 0 + 5 + 112 = 666.

It is a super-3 number, since 3×21215520005112³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215520005117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30615537 + ... + 31300832.

It is an arithmetic number, because the mean of its divisors is an integer number (1197307804875).

Almost surely, 2^{21215520005112} is an apocalyptic number.

It is an amenable number.

21215520005112 is an abundant number, since it is smaller than the sum of its proper divisors (36255254628888).

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

21215520005112 is a wasteful number, since it uses less digits than its factorization.

21215520005112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61921140 (or 61921133 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 21215520005112 its reverse (21150002551212), we get a palindrome (42365522556324).

The spelling of 21215520005112 in words is "twenty-one trillion, two hundred fifteen billion, five hundred twenty million, five thousand, one hundred twelve".