21203023231 has 8 divisors (see below), whose sum is σ = 22911960960. Its totient is φ = 19505219232.

The previous prime is 21203023183. The next prime is 21203023249. The reversal of 21203023231 is 13232030212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21203023231 - 2⁷ = 21203023103 is a prime.

It is a super-2 number, since 2×21203023231² (a number of 21 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 = 21203023199 and 21203023208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203023291) 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, 2779471 + ... + 2787088.

It is an arithmetic number, because the mean of its divisors is an integer number (2863995120).

Almost surely, 2^21203023231 is an apocalyptic number.

21203023231 is a deficient number, since it is larger than the sum of its proper divisors (1708937729).

21203023231 is a wasteful number, since it uses less digits than its factorization.

21203023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566865.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21203023231 its reverse (13232030212), we get a palindrome (34435053443).

The spelling of 21203023231 in words is "twenty-one billion, two hundred three million, twenty-three thousand, two hundred thirty-one".