21232301331 has 4 divisors (see below), whose sum is σ = 28309735112. Its totient is φ = 14154867552.

The previous prime is 21232301323. The next prime is 21232301341. The reversal of 21232301331 is 13310323212.

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

It is not a de Polignac number, because 21232301331 - 2³ = 21232301323 is a prime.

It is a super-2 number, since 2×21232301331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232301298 and 21232301307.

It is not an unprimeable number, because it can be changed into a prime (21232301341) 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 3 ways as a sum of consecutive naturals, for example, 3538716886 + ... + 3538716891.

It is an arithmetic number, because the mean of its divisors is an integer number (7077433778).

Almost surely, 2^21232301331 is an apocalyptic number.

21232301331 is a deficient number, since it is larger than the sum of its proper divisors (7077433781).

21232301331 is an equidigital number, since it uses as much as digits as its factorization.

21232301331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077433780.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21232301331 its reverse (13310323212), we get a palindrome (34542624543).

The spelling of 21232301331 in words is "twenty-one billion, two hundred thirty-two million, three hundred one thousand, three hundred thirty-one".