21235030231 has 2 divisors, whose sum is σ = 21235030232. Its totient is φ = 21235030230.

The previous prime is 21235030207. The next prime is 21235030237. The reversal of 21235030231 is 13203053212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21235030231 - 2¹⁷ = 21234899159 is a prime.

It is a super-2 number, since 2×21235030231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21235030237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617515115 + 10617515116.

It is an arithmetic number, because the mean of its divisors is an integer number (10617515116).

Almost surely, 2^21235030231 is an apocalyptic number.

21235030231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235030231 is an equidigital number, since it uses as much as digits as its factorization.

21235030231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21235030231 its reverse (13203053212), we get a palindrome (34438083443).

The spelling of 21235030231 in words is "twenty-one billion, two hundred thirty-five million, thirty thousand, two hundred thirty-one".