21002112201 has 16 divisors (see below), whose sum is σ = 32071762944. Its totient is φ = 11975502864.

The previous prime is 21002112167. The next prime is 21002112203. The reversal of 21002112201 is 10221120012.

It is not a de Polignac number, because 21002112201 - 2²⁷ = 20867894473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002112203) 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, 1060965 + ... + 1080578.

It is an arithmetic number, because the mean of its divisors is an integer number (2004485184).

Almost surely, 2^21002112201 is an apocalyptic number.

21002112201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21002112201 is a deficient number, since it is larger than the sum of its proper divisors (11069650743).

21002112201 is a wasteful number, since it uses less digits than its factorization.

21002112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142020.

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

Adding to 21002112201 its reverse (10221120012), we get a palindrome (31223232213).

It can be divided in two parts, 210021 and 12201, that added together give a palindrome (222222).

The spelling of 21002112201 in words is "twenty-one billion, two million, one hundred twelve thousand, two hundred one".