21433004131 has 16 divisors (see below), whose sum is σ = 28128072960. Its totient is φ = 15822038880.

The previous prime is 21433004129. The next prime is 21433004141. The reversal of 21433004131 is 13140033412.

It is a cyclic number.

It is not a de Polignac number, because 21433004131 - 2¹ = 21433004129 is a prime.

It is a super-2 number, since 2×21433004131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433004111) 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, 7323556 + ... + 7326481.

It is an arithmetic number, because the mean of its divisors is an integer number (1758004560).

Almost surely, 2^21433004131 is an apocalyptic number.

21433004131 is a deficient number, since it is larger than the sum of its proper divisors (6695068829).

21433004131 is a wasteful number, since it uses less digits than its factorization.

21433004131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14650074.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21433004131 its reverse (13140033412), we get a palindrome (34573037543).

The spelling of 21433004131 in words is "twenty-one billion, four hundred thirty-three million, four thousand, one hundred thirty-one".