21323301320 has 64 divisors (see below), whose sum is σ = 50075126640. Its totient is φ = 8164249600.

The previous prime is 21323301319. The next prime is 21323301341. The reversal of 21323301320 is 2310332312.

It can be written as a sum of positive squares in 8 ways, for example, as 3953642884 + 17369658436 = 62878^2 + 131794^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21323301292 and 21323301301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35741 + ... + 209580.

Almost surely, 2^21323301320 is an apocalyptic number.

21323301320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323301320 is an abundant number, since it is smaller than the sum of its proper divisors (28751825320).

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

21323301320 is a wasteful number, since it uses less digits than its factorization.

21323301320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245426 (or 245422 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21323301320 its reverse (2310332312), we get a palindrome (23633633632).

The spelling of 21323301320 in words is "twenty-one billion, three hundred twenty-three million, three hundred one thousand, three hundred twenty".