21203330231 has 8 divisors (see below), whose sum is σ = 22324337280. Its totient is φ = 20082827448.

The previous prime is 21203330221. The next prime is 21203330233. The reversal of 21203330231 is 13203330212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203330231 is a prime.

It is a super-2 number, since 2×21203330231² (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 (21203330233) 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, 38171 + ... + 209436.

It is an arithmetic number, because the mean of its divisors is an integer number (2790542160).

Almost surely, 2^21203330231 is an apocalyptic number.

21203330231 is a deficient number, since it is larger than the sum of its proper divisors (1121007049).

21203330231 is a wasteful number, since it uses less digits than its factorization.

21203330231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252133.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21203330231 its reverse (13203330212), we get a palindrome (34406660443).

The spelling of 21203330231 in words is "twenty-one billion, two hundred three million, three hundred thirty thousand, two hundred thirty-one".