231212505403 has 8 divisors (see below), whose sum is σ = 252745540416. Its totient is φ = 209765089800.

The previous prime is 231212505397. The next prime is 231212505409. The reversal of 231212505403 is 304505212132.

It is an interprime number because it is at equal distance from previous prime (231212505397) and next prime (231212505409).

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 231212505403 - 2⁹ = 231212504891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231212505409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21399201 + ... + 21410002.

It is an arithmetic number, because the mean of its divisors is an integer number (31593192552).

Almost surely, 2^231212505403 is an apocalyptic number.

231212505403 is a deficient number, since it is larger than the sum of its proper divisors (21533035013).

231212505403 is a wasteful number, since it uses less digits than its factorization.

231212505403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42809705.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 231212505403 its reverse (304505212132), we get a palindrome (535717717535).

The spelling of 231212505403 in words is "two hundred thirty-one billion, two hundred twelve million, five hundred five thousand, four hundred three".