21120020202201 has 16 divisors (see below), whose sum is σ = 28529585481600. Its totient is φ = 13896042859008.

The previous prime is 21120020202187. The next prime is 21120020202223. The reversal of 21120020202201 is 10220202002112.

It is a de Polignac number, because none of the positive numbers 2^k-21120020202201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120020202601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100978246 + ... + 101187183.

It is an arithmetic number, because the mean of its divisors is an integer number (1783099092600).

Almost surely, 2^{21120020202201} is an apocalyptic number.

It is an amenable number.

21120020202201 is a deficient number, since it is larger than the sum of its proper divisors (7409565279399).

21120020202201 is a wasteful number, since it uses less digits than its factorization.

21120020202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202165888.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21120020202201 its reverse (10220202002112), we get a palindrome (31340222204313).

The spelling of 21120020202201 in words is "twenty-one trillion, one hundred twenty billion, twenty million, two hundred two thousand, two hundred one".