21235231201 has 4 divisors (see below), whose sum is σ = 21273356052. Its totient is φ = 21197106352.

The previous prime is 21235231181. The next prime is 21235231217. The reversal of 21235231201 is 10213253212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 578643025 + 20656588176 = 24055^2 + 143724^2 .

It is a cyclic number.

It is not a de Polignac number, because 21235231201 - 2⁵ = 21235231169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21235231271) 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, 19061590 + ... + 19062703.

It is an arithmetic number, because the mean of its divisors is an integer number (5318339013).

Almost surely, 2^21235231201 is an apocalyptic number.

It is an amenable number.

21235231201 is a deficient number, since it is larger than the sum of its proper divisors (38124851).

21235231201 is an equidigital number, since it uses as much as digits as its factorization.

21235231201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38124850.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21235231201 its reverse (10213253212), we get a palindrome (31448484413).

The spelling of 21235231201 in words is "twenty-one billion, two hundred thirty-five million, two hundred thirty-one thousand, two hundred one".