21201212120011 has 12 divisors (see below), whose sum is σ = 26632927622896. Its totient is φ = 16520425027920.

The previous prime is 21201212119991. The next prime is 21201212120027. The reversal of 21201212120011 is 11002121210212.

It is not a de Polignac number, because 21201212120011 - 2²¹ = 21201210022859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201212120041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12515472660 + ... + 12515474353.

Almost surely, 2^{21201212120011} is an apocalyptic number.

21201212120011 is a deficient number, since it is larger than the sum of its proper divisors (5431715502885).

21201212120011 is a wasteful number, since it uses less digits than its factorization.

21201212120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25030947042 (or 25030947031 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201212120011 its reverse (11002121210212), we get a palindrome (32203333330223).

It can be divided in two parts, 21201 and 212120011, that added together give a palindrome (212141212).

The spelling of 21201212120011 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, one hundred twenty thousand, eleven".