21043240134 has 32 divisors (see below), whose sum is σ = 48103200000. Its totient is φ = 6011808672.

The previous prime is 21043240129. The next prime is 21043240139. The reversal of 21043240134 is 43104234012.

It is an interprime number because it is at equal distance from previous prime (21043240129) and next prime (21043240139).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043240139) 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 15 ways as a sum of consecutive naturals, for example, 774097 + ... + 800819.

It is an arithmetic number, because the mean of its divisors is an integer number (1503225000).

Almost surely, 2^21043240134 is an apocalyptic number.

21043240134 is an abundant number, since it is smaller than the sum of its proper divisors (27059959866).

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

21043240134 is a wasteful number, since it uses less digits than its factorization.

21043240134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45484.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21043240134 its reverse (43104234012), we get a palindrome (64147474146).

The spelling of 21043240134 in words is "twenty-one billion, forty-three million, two hundred forty thousand, one hundred thirty-four".