21031021323320 has 32 divisors (see below), whose sum is σ = 47381332244400. Its totient is φ = 8401469104128.

The previous prime is 21031021323269. The next prime is 21031021323353. The reversal of 21031021323320 is 2332312013012.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 341825894 + ... + 341887413.

Almost surely, 2^{21031021323320} is an apocalyptic number.

21031021323320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031021323320 is an abundant number, since it is smaller than the sum of its proper divisors (26350310921080).

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

21031021323320 is a wasteful number, since it uses less digits than its factorization.

21031021323320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683714087 (or 683714083 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21031021323320 its reverse (2332312013012), we get a palindrome (23363333336332).

The spelling of 21031021323320 in words is "twenty-one trillion, thirty-one billion, twenty-one million, three hundred twenty-three thousand, three hundred twenty".