21301223232 has 56 divisors (see below), whose sum is σ = 57882735136. Its totient is φ = 6908502528.

The previous prime is 21301223221. The next prime is 21301223233. The reversal of 21301223232 is 23232210312.

It is a happy number.

It is a super-2 number, since 2×21301223232² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21301223199 and 21301223208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301223233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1492138 + ... + 1506345.

Almost surely, 2^21301223232 is an apocalyptic number.

It is an amenable number.

21301223232 is an abundant number, since it is smaller than the sum of its proper divisors (36581511904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301223232 is a wasteful number, since it uses less digits than its factorization.

21301223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998535 (or 2998525 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21301223232 its reverse (23232210312), we get a palindrome (44533433544).

The spelling of 21301223232 in words is "twenty-one billion, three hundred one million, two hundred twenty-three thousand, two hundred thirty-two".