21504153043 has 16 divisors (see below), whose sum is σ = 22986966240. Its totient is φ = 20046237696.

The previous prime is 21504153019. The next prime is 21504153053. The reversal of 21504153043 is 34035140512.

It is a cyclic number.

It is not a de Polignac number, because 21504153043 - 2²¹ = 21502055891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21504153053) 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, 1012671 + ... + 1033687.

It is an arithmetic number, because the mean of its divisors is an integer number (1436685390).

Almost surely, 2^21504153043 is an apocalyptic number.

21504153043 is a deficient number, since it is larger than the sum of its proper divisors (1482813197).

21504153043 is a wasteful number, since it uses less digits than its factorization.

21504153043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21606.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21504153043 its reverse (34035140512), we get a palindrome (55539293555).

The spelling of 21504153043 in words is "twenty-one billion, five hundred four million, one hundred fifty-three thousand, forty-three".