21131440034 has 16 divisors (see below), whose sum is σ = 33552731520. Its totient is φ = 9964142160.

The previous prime is 21131440027. The next prime is 21131440039. The reversal of 21131440034 is 43004413112.

It is a junction number, because it is equal to n+sod(n) for n = 21131439991 and 21131440009.

It is not an unprimeable number, because it can be changed into a prime (21131440039) 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 7 ways as a sum of consecutive naturals, for example, 4233962 + ... + 4238949.

It is an arithmetic number, because the mean of its divisors is an integer number (2097045720).

Almost surely, 2^21131440034 is an apocalyptic number.

21131440034 is a deficient number, since it is larger than the sum of its proper divisors (12421291486).

21131440034 is a wasteful number, since it uses less digits than its factorization.

21131440034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472985.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21131440034 its reverse (43004413112), we get a palindrome (64135853146).

The spelling of 21131440034 in words is "twenty-one billion, one hundred thirty-one million, four hundred forty thousand, thirty-four".