21040431230 has 64 divisors (see below), whose sum is σ = 46953164160. Its totient is φ = 6610305024.

The previous prime is 21040431221. The next prime is 21040431233. The reversal of 21040431230 is 3213404012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040431233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40286 + ... + 209054.

It is an arithmetic number, because the mean of its divisors is an integer number (733643190).

Almost surely, 2^21040431230 is an apocalyptic number.

21040431230 is an abundant number, since it is smaller than the sum of its proper divisors (25912732930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21040431230 is a wasteful number, since it uses less digits than its factorization.

21040431230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168933.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21040431230 its reverse (3213404012), we get a palindrome (24253835242).

The spelling of 21040431230 in words is "twenty-one billion, forty million, four hundred thirty-one thousand, two hundred thirty".