21054040005 has 16 divisors (see below), whose sum is σ = 33755647104. Its totient is φ = 11205760320.

The previous prime is 21054039947. The next prime is 21054040013. The reversal of 21054040005 is 50004045012.

It is not a de Polignac number, because 21054040005 - 2¹⁸ = 21053777861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1433766 + ... + 1448375.

It is an arithmetic number, because the mean of its divisors is an integer number (2109727944).

Almost surely, 2^21054040005 is an apocalyptic number.

It is an amenable number.

21054040005 is a deficient number, since it is larger than the sum of its proper divisors (12701607099).

21054040005 is a wasteful number, since it uses less digits than its factorization.

21054040005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882636.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 21054040005 its reverse (50004045012), we get a palindrome (71058085017).

The spelling of 21054040005 in words is "twenty-one billion, fifty-four million, forty thousand, five".