21203120322331 has 4 divisors (see below), whose sum is σ = 21887091945664. Its totient is φ = 20519148699000.

The previous prime is 21203120322311. The next prime is 21203120322353. The reversal of 21203120322331 is 13322302130212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21203120322331 - 2³⁹ = 20653364508443 is a prime.

It is a super-2 number, since 2×21203120322331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203120322296 and 21203120322305.

It is not an unprimeable number, because it can be changed into a prime (21203120322311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341985811620 + ... + 341985811681.

It is an arithmetic number, because the mean of its divisors is an integer number (5471772986416).

Almost surely, 2^{21203120322331} is an apocalyptic number.

21203120322331 is a deficient number, since it is larger than the sum of its proper divisors (683971623333).

21203120322331 is an equidigital number, since it uses as much as digits as its factorization.

21203120322331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683971623332.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21203120322331 its reverse (13322302130212), we get a palindrome (34525422452543).

The spelling of 21203120322331 in words is "twenty-one trillion, two hundred three billion, one hundred twenty million, three hundred twenty-two thousand, three hundred thirty-one".