21001200011212 has 24 divisors (see below), whose sum is σ = 37313806655216. Its totient is φ = 10340223049728.

The previous prime is 21001200011191. The next prime is 21001200011273. The reversal of 21001200011212 is 21211000210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001200011192 and 21001200011201.

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, 13071093 + ... + 14589580.

Almost surely, 2^{21001200011212} is an apocalyptic number.

It is an amenable number.

21001200011212 is a deficient number, since it is larger than the sum of its proper divisors (16312606644004).

21001200011212 is a wasteful number, since it uses less digits than its factorization.

21001200011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27663577 (or 27663575 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001200011212 its reverse (21211000210012), we get a palindrome (42212200221224).

The spelling of 21001200011212 in words is "twenty-one trillion, one billion, two hundred million, eleven thousand, two hundred twelve".