21120021201 has 16 divisors (see below), whose sum is σ = 28483202880. Its totient is φ = 13918502400.

The previous prime is 21120021187. The next prime is 21120021211. The reversal of 21120021201 is 10212002112.

It is not a de Polignac number, because 21120021201 - 2⁹ = 21120020689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120021211) 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, 1690026 + ... + 1702476.

It is an arithmetic number, because the mean of its divisors is an integer number (1780200180).

Almost surely, 2^21120021201 is an apocalyptic number.

It is an amenable number.

21120021201 is a deficient number, since it is larger than the sum of its proper divisors (7363181679).

21120021201 is a wasteful number, since it uses less digits than its factorization.

21120021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18896.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120021201 its reverse (10212002112), we get a palindrome (31332023313).

The spelling of 21120021201 in words is "twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred one".