21201420211 has 8 divisors (see below), whose sum is σ = 21899058048. Its totient is φ = 20504640000.

The previous prime is 21201420197. The next prime is 21201420221. The reversal of 21201420211 is 11202410212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201420211 - 2¹³ = 21201412019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201420221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163960 + ... + 263221.

It is an arithmetic number, because the mean of its divisors is an integer number (2737382256).

Almost surely, 2^21201420211 is an apocalyptic number.

21201420211 is a deficient number, since it is larger than the sum of its proper divisors (697637837).

21201420211 is a wasteful number, since it uses less digits than its factorization.

21201420211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428813.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201420211 its reverse (11202410212), we get a palindrome (32403830423).

Subtracting from 21201420211 its reverse (11202410212), we obtain a palindrome (9999009999).

The spelling of 21201420211 in words is "twenty-one billion, two hundred one million, four hundred twenty thousand, two hundred eleven".