21230131235 has 8 divisors (see below), whose sum is σ = 25479286560. Its totient is φ = 16982018944.

The previous prime is 21230131231. The next prime is 21230131259. The reversal of 21230131235 is 53213103212.

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 21230131235 - 2² = 21230131231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21230131235.

It is not an unprimeable number, because it can be changed into a prime (21230131231) 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, 215255 + ... + 297984.

It is an arithmetic number, because the mean of its divisors is an integer number (3184910820).

Almost surely, 2^21230131235 is an apocalyptic number.

21230131235 is a deficient number, since it is larger than the sum of its proper divisors (4249155325).

21230131235 is an equidigital number, since it uses as much as digits as its factorization.

21230131235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521517.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21230131235 its reverse (53213103212), we get a palindrome (74443234447).

The spelling of 21230131235 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, two hundred thirty-five".