21001201100012 has 24 divisors (see below), whose sum is σ = 42005016327456. Its totient is φ = 8999954587008.

The previous prime is 21001201099999. The next prime is 21001201100041. The reversal of 21001201100012 is 21000110210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001201099966 and 21001201100002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22882343 + ... + 23782430.

It is an arithmetic number, because the mean of its divisors is an integer number (1750209013644).

Almost surely, 2^{21001201100012} is an apocalyptic number.

It is an amenable number.

21001201100012 is an abundant number, since it is smaller than the sum of its proper divisors (21003815227444).

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

21001201100012 is a wasteful number, since it uses less digits than its factorization.

21001201100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46680857 (or 46680855 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001201100012 its reverse (21000110210012), we get a palindrome (42001311310024).

The spelling of 21001201100012 in words is "twenty-one trillion, one billion, two hundred one million, one hundred thousand, twelve".