21230203031 has 8 divisors (see below), whose sum is σ = 21408006144. Its totient is φ = 21052566360.

The previous prime is 21230202977. The next prime is 21230203063. The reversal of 21230203031 is 13030203212.

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-21230203031 is a prime.

It is a super-2 number, since 2×21230203031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230203231) 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, 221486 + ... + 302516.

It is an arithmetic number, because the mean of its divisors is an integer number (2676000768).

Almost surely, 2^21230203031 is an apocalyptic number.

21230203031 is a deficient number, since it is larger than the sum of its proper divisors (177803113).

21230203031 is a wasteful number, since it uses less digits than its factorization.

21230203031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83221.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21230203031 its reverse (13030203212), we get a palindrome (34260406243).

The spelling of 21230203031 in words is "twenty-one billion, two hundred thirty million, two hundred three thousand, thirty-one".