21213232201 has 4 divisors (see below), whose sum is σ = 24243693952. Its totient is φ = 18182770452.

The previous prime is 21213232177. The next prime is 21213232217. The reversal of 21213232201 is 10223231212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21213232201 - 2⁵ = 21213232169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213232801) 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, 1515230865 + ... + 1515230878.

It is an arithmetic number, because the mean of its divisors is an integer number (6060923488).

Almost surely, 2^21213232201 is an apocalyptic number.

It is an amenable number.

21213232201 is a deficient number, since it is larger than the sum of its proper divisors (3030461751).

21213232201 is an equidigital number, since it uses as much as digits as its factorization.

21213232201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030461750.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21213232201 its reverse (10223231212), we get a palindrome (31436463413).

The spelling of 21213232201 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-two thousand, two hundred one".