21221200011212 has 24 divisors (see below), whose sum is σ = 40439673346800. Its totient is φ = 9705521601216.

The previous prime is 21221200011199. The next prime is 21221200011251. The reversal of 21221200011212 is 21211000212212.

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, 4814244623 + ... + 4814249030.

It is an arithmetic number, because the mean of its divisors is an integer number (1684986389450).

Almost surely, 2^{21221200011212} is an apocalyptic number.

It is an amenable number.

21221200011212 is a deficient number, since it is larger than the sum of its proper divisors (19218473335588).

21221200011212 is a wasteful number, since it uses less digits than its factorization.

21221200011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9628493705 (or 9628493703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221200011212 its reverse (21211000212212), we get a palindrome (42432200223424).

The spelling of 21221200011212 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, eleven thousand, two hundred twelve".