21221100211112 has 8 divisors (see below), whose sum is σ = 39789562895850. Its totient is φ = 10610550105552.

The previous prime is 21221100211093. The next prime is 21221100211133. The reversal of 21221100211112 is 21111200112212.

It can be written as a sum of positive squares in only one way, i.e., 17257759828516 + 3963340382596 = 4154246^2 + 1990814^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326318763187 + ... + 1326318763202.

Almost surely, 2^{21221100211112} is an apocalyptic number.

It is an amenable number.

21221100211112 is a deficient number, since it is larger than the sum of its proper divisors (18568462684738).

21221100211112 is a wasteful number, since it uses less digits than its factorization.

21221100211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652637526395 (or 2652637526391 counting only the distinct ones).

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

Adding to 21221100211112 its reverse (21111200112212), we get a palindrome (42332300323324).

The spelling of 21221100211112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred million, two hundred eleven thousand, one hundred twelve".