21001201210212 has 24 divisors (see below), whose sum is σ = 49216788868800. Its totient is φ = 6969830968416.

The previous prime is 21001201210169. The next prime is 21001201210219. The reversal of 21001201210212 is 21201210210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001201210191 and 21001201210200.

It is not an unprimeable number, because it can be changed into a prime (21001201210219) 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, 3821176512 + ... + 3821182007.

It is an arithmetic number, because the mean of its divisors is an integer number (2050699536200).

Almost surely, 2^{21001201210212} is an apocalyptic number.

It is an amenable number.

21001201210212 is an abundant number, since it is smaller than the sum of its proper divisors (28215587658588).

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

21001201210212 is a wasteful number, since it uses less digits than its factorization.

21001201210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7642358755 (or 7642358753 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001201210212 its reverse (21201210210012), we get a palindrome (42202411420224).

The spelling of 21001201210212 in words is "twenty-one trillion, one billion, two hundred one million, two hundred ten thousand, two hundred twelve".