21040015230345 has 16 divisors (see below), whose sum is σ = 33675907254912. Its totient is φ = 11217380494080.

The previous prime is 21040015230253. The next prime is 21040015230349. The reversal of 21040015230345 is 54303251004012.

It is not a de Polignac number, because 21040015230345 - 2¹⁶ = 21040015164809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21040015230349) 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, 247516221 + ... + 247601210.

It is an arithmetic number, because the mean of its divisors is an integer number (2104744203432).

Almost surely, 2^{21040015230345} is an apocalyptic number.

It is an amenable number.

21040015230345 is a deficient number, since it is larger than the sum of its proper divisors (12635892024567).

21040015230345 is a wasteful number, since it uses less digits than its factorization.

21040015230345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495120272.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21040015230345 its reverse (54303251004012), we get a palindrome (75343266234357).

The spelling of 21040015230345 in words is "twenty-one trillion, forty billion, fifteen million, two hundred thirty thousand, three hundred forty-five".