21203230231320 has 32 divisors (see below), whose sum is σ = 63609690694320. Its totient is φ = 5654194728320.

The previous prime is 21203230231291. The next prime is 21203230231327. The reversal of 21203230231320 is 2313203230212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203230231327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88346792511 + ... + 88346792750.

Almost surely, 2^{21203230231320} is an apocalyptic number.

21203230231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203230231320 is an abundant number, since it is smaller than the sum of its proper divisors (42406460463000).

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

21203230231320 is a wasteful number, since it uses less digits than its factorization.

21203230231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176693585275 (or 176693585271 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21203230231320 its reverse (2313203230212), we get a palindrome (23516433461532).

The spelling of 21203230231320 in words is "twenty-one trillion, two hundred three billion, two hundred thirty million, two hundred thirty-one thousand, three hundred twenty".