21212002012112 has 20 divisors (see below), whose sum is σ = 41205560056320. Its totient is φ = 10578309094368.

The previous prime is 21212002012111. The next prime is 21212002012121. The reversal of 21212002012112 is 21121020021212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212002012111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1730738162 + ... + 1730750417.

It is an arithmetic number, because the mean of its divisors is an integer number (2060278002816).

Almost surely, 2^{21212002012112} is an apocalyptic number.

It is an amenable number.

21212002012112 is a deficient number, since it is larger than the sum of its proper divisors (19993558044208).

21212002012112 is a wasteful number, since it uses less digits than its factorization.

21212002012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461488970 (or 3461488964 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212002012112 its reverse (21121020021212), we get a palindrome (42333022033324).

The spelling of 21212002012112 in words is "twenty-one trillion, two hundred twelve billion, two million, twelve thousand, one hundred twelve".