21323201020 has 24 divisors (see below), whose sum is σ = 48849515568. Its totient is φ = 7753891200.

The previous prime is 21323200999. The next prime is 21323201083. The reversal of 21323201020 is 2010232312.

It is a junction number, because it is equal to n+sod(n) for n = 21323200985 and 21323201003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48461601 + ... + 48462040.

It is an arithmetic number, because the mean of its divisors is an integer number (2035396482).

Almost surely, 2^21323201020 is an apocalyptic number.

21323201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323201020 is an abundant number, since it is smaller than the sum of its proper divisors (27526314548).

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

21323201020 is a wasteful number, since it uses less digits than its factorization.

21323201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96923661 (or 96923659 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21323201020 its reverse (2010232312), we get a palindrome (23333433332).

The spelling of 21323201020 in words is "twenty-one billion, three hundred twenty-three million, two hundred one thousand, twenty".