21211201021112 has 8 divisors (see below), whose sum is σ = 39771001914600. Its totient is φ = 10605600510552.

The previous prime is 21211201021079. The next prime is 21211201021151. The reversal of 21211201021112 is 21112010211212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325700063812 + ... + 1325700063827.

It is an arithmetic number, because the mean of its divisors is an integer number (4971375239325).

Almost surely, 2^{21211201021112} is an apocalyptic number.

It is an amenable number.

21211201021112 is a deficient number, since it is larger than the sum of its proper divisors (18559800893488).

21211201021112 is a wasteful number, since it uses less digits than its factorization.

21211201021112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651400127645 (or 2651400127641 counting only the distinct ones).

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

Adding to 21211201021112 its reverse (21112010211212), we get a palindrome (42323211232324).

The spelling of 21211201021112 in words is "twenty-one trillion, two hundred eleven billion, two hundred one million, twenty-one thousand, one hundred twelve".