21320235321 has 32 divisors (see below), whose sum is σ = 35459693568. Its totient is φ = 11069739840.

The previous prime is 21320235311. The next prime is 21320235383. The reversal of 21320235321 is 12353202312.

It is a happy number.

It is not a de Polignac number, because 21320235321 - 2⁹ = 21320234809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320235291 and 21320235300.

It is not an unprimeable number, because it can be changed into a prime (21320235311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445471 + ... + 491003.

It is an arithmetic number, because the mean of its divisors is an integer number (1108115424).

Almost surely, 2^21320235321 is an apocalyptic number.

21320235321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21320235321 is a deficient number, since it is larger than the sum of its proper divisors (14139458247).

21320235321 is a wasteful number, since it uses less digits than its factorization.

21320235321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47581.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21320235321 its reverse (12353202312), we get a palindrome (33673437633).

The spelling of 21320235321 in words is "twenty-one billion, three hundred twenty million, two hundred thirty-five thousand, three hundred twenty-one".