21013240430 has 64 divisors (see below), whose sum is σ = 47635112448. Its totient is φ = 6495672960.

The previous prime is 21013240421. The next prime is 21013240433. The reversal of 21013240430 is 3404231012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013240433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229376 + ... + 307635.

It is an arithmetic number, because the mean of its divisors is an integer number (744298632).

Almost surely, 2^21013240430 is an apocalyptic number.

21013240430 is an abundant number, since it is smaller than the sum of its proper divisors (26621872018).

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

21013240430 is a wasteful number, since it uses less digits than its factorization.

21013240430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537081.

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

Adding to 21013240430 its reverse (3404231012), we get a palindrome (24417471442).

The spelling of 21013240430 in words is "twenty-one billion, thirteen million, two hundred forty thousand, four hundred thirty".