21232120231 has 8 divisors (see below), whose sum is σ = 24857116704. Its totient is φ = 17755082880.

The previous prime is 21232120229. The next prime is 21232120271. The reversal of 21232120231 is 13202123212.

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

It is a cyclic number.

It is not a de Polignac number, because 21232120231 - 2¹ = 21232120229 is a prime.

It is a super-2 number, since 2×21232120231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21232120199 and 21232120208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232120271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36989470 + ... + 36990043.

It is an arithmetic number, because the mean of its divisors is an integer number (3107139588).

Almost surely, 2^21232120231 is an apocalyptic number.

21232120231 is a deficient number, since it is larger than the sum of its proper divisors (3624996473).

21232120231 is an equidigital number, since it uses as much as digits as its factorization.

21232120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73979561.

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

Adding to 21232120231 its reverse (13202123212), we get a palindrome (34434243443).

The spelling of 21232120231 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty thousand, two hundred thirty-one".