21201112210 has 8 divisors (see below), whose sum is σ = 38162001996. Its totient is φ = 8480444880.

The previous prime is 21201112189. The next prime is 21201112217. The reversal of 21201112210 is 1221110212.

It can be written as a sum of positive squares in 2 ways, for example, as 20598851529 + 602260681 = 143523^2 + 24541^2 .

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

It is a super-2 number, since 2×21201112210² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201112217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060055601 + ... + 1060055620.

Almost surely, 2^21201112210 is an apocalyptic number.

21201112210 is a deficient number, since it is larger than the sum of its proper divisors (16960889786).

21201112210 is a wasteful number, since it uses less digits than its factorization.

21201112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120111228.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201112210 its reverse (1221110212), we get a palindrome (22422222422).

The spelling of 21201112210 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, two hundred ten".