21211101212012 has 24 divisors (see below), whose sum is σ = 37239468771456. Its totient is φ = 10571255630208.

The previous prime is 21211101212011. The next prime is 21211101212023. The reversal of 21211101212012 is 21021210111212.

It is not an unprimeable number, because it can be changed into a prime (21211101212011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33216038 + ... + 33848594.

It is an arithmetic number, because the mean of its divisors is an integer number (1551644532144).

Almost surely, 2^{21211101212012} is an apocalyptic number.

It is an amenable number.

21211101212012 is a deficient number, since it is larger than the sum of its proper divisors (16028367559444).

21211101212012 is a wasteful number, since it uses less digits than its factorization.

21211101212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659657 (or 659655 counting only the distinct ones).

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

Adding to 21211101212012 its reverse (21021210111212), we get a palindrome (42232311323224).

The spelling of 21211101212012 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, two hundred twelve thousand, twelve".