21320140430 has 16 divisors (see below), whose sum is σ = 38426961600. Its totient is φ = 8516787552.

The previous prime is 21320140427. The next prime is 21320140463. The reversal of 21320140430 is 3404102312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1400630 + ... + 1415769.

It is an arithmetic number, because the mean of its divisors is an integer number (2401685100).

Almost surely, 2^21320140430 is an apocalyptic number.

21320140430 is a deficient number, since it is larger than the sum of its proper divisors (17106821170).

21320140430 is a wasteful number, since it uses less digits than its factorization.

21320140430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817163.

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

Adding to 21320140430 its reverse (3404102312), we get a palindrome (24724242742).

The spelling of 21320140430 in words is "twenty-one billion, three hundred twenty million, one hundred forty thousand, four hundred thirty".