21131440023 has 16 divisors (see below), whose sum is σ = 28355233536. Its totient is φ = 13997704320.

The previous prime is 21131440019. The next prime is 21131440027. The reversal of 21131440023 is 32004413112.

It is an interprime number because it is at equal distance from previous prime (21131440019) and next prime (21131440027).

It is not a de Polignac number, because 21131440023 - 2² = 21131440019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131440027) 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 15 ways as a sum of consecutive naturals, for example, 1537743 + ... + 1551423.

It is an arithmetic number, because the mean of its divisors is an integer number (1772202096).

Almost surely, 2^21131440023 is an apocalyptic number.

21131440023 is a deficient number, since it is larger than the sum of its proper divisors (7223793513).

21131440023 is a wasteful number, since it uses less digits than its factorization.

21131440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16934.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21131440023 its reverse (32004413112), we get a palindrome (53135853135).

The spelling of 21131440023 in words is "twenty-one billion, one hundred thirty-one million, four hundred forty thousand, twenty-three".