21203310231 has 24 divisors (see below), whose sum is σ = 32571502704. Its totient is φ = 13245408000.

The previous prime is 21203310217. The next prime is 21203310263. The reversal of 21203310231 is 13201330212.

21203310231 is a `hidden beast` number, since 2 + 120 + 3 + 310 + 231 = 666.

It is not a de Polignac number, because 21203310231 - 2¹³ = 21203302039 is a prime.

It is a super-2 number, since 2×21203310231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203310131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270520 + ... + 339981.

It is an arithmetic number, because the mean of its divisors is an integer number (1357145946).

Almost surely, 2^21203310231 is an apocalyptic number.

21203310231 is a deficient number, since it is larger than the sum of its proper divisors (11368192473).

21203310231 is a wasteful number, since it uses less digits than its factorization.

21203310231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610751 (or 610748 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21203310231 its reverse (13201330212), we get a palindrome (34404640443).

The spelling of 21203310231 in words is "twenty-one billion, two hundred three million, three hundred ten thousand, two hundred thirty-one".