21040315153055 has 16 divisors (see below), whose sum is σ = 27543817857024. Its totient is φ = 15301973736480.

The previous prime is 21040315153009. The next prime is 21040315153079. The reversal of 21040315153055 is 55035151304012.

It is not a de Polignac number, because 21040315153055 - 2¹² = 21040315148959 is a prime.

It is a Duffinian number.

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, 12328754 + ... + 13931216.

It is an arithmetic number, because the mean of its divisors is an integer number (1721488616064).

Almost surely, 2^{21040315153055} is an apocalyptic number.

21040315153055 is a deficient number, since it is larger than the sum of its proper divisors (6503502703969).

21040315153055 is a wasteful number, since it uses less digits than its factorization.

21040315153055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841206.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 21040315153055 its reverse (55035151304012), we get a palindrome (76075466457067).

The spelling of 21040315153055 in words is "twenty-one trillion, forty billion, three hundred fifteen million, one hundred fifty-three thousand, fifty-five".