21211101211212 has 60 divisors (see below), whose sum is σ = 60490918279176. Its totient is φ = 6427606426560.

The previous prime is 21211101211211. The next prime is 21211101211217. The reversal of 21211101211212 is 21211210111212.

It is a happy number.

21211101211212 is a `hidden beast` number, since 21 + 211 + 10 + 1 + 211 + 212 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21211101211211) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 2975740153 + ... + 2975747280.

Almost surely, 2^{21211101211212} is an apocalyptic number.

21211101211212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211101211212 is an abundant number, since it is smaller than the sum of its proper divisors (39279817067964).

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

21211101211212 is a wasteful number, since it uses less digits than its factorization.

21211101211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951487460 (or 5951487449 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21211101211212 its reverse (21211210111212), we get a palindrome (42422311322424).

The spelling of 21211101211212 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, two hundred eleven thousand, two hundred twelve".