21439153041255 has 24 divisors (see below), whose sum is σ = 37177127290368. Its totient is φ = 11429313821376.

The previous prime is 21439153041247. The next prime is 21439153041259. The reversal of 21439153041255 is 55214035193412.

21439153041255 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 91 + 5 + 304 + 1 + 255 = 666.

It is not a de Polignac number, because 21439153041255 - 2³ = 21439153041247 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21439153041255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439153041259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102000807 + ... + 102210776.

It is an arithmetic number, because the mean of its divisors is an integer number (1549046970432).

Almost surely, 2^{21439153041255} is an apocalyptic number.

21439153041255 is a deficient number, since it is larger than the sum of its proper divisors (15737974249113).

21439153041255 is a wasteful number, since it uses less digits than its factorization.

21439153041255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204213927 (or 204213924 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 21439153041255 in words is "twenty-one trillion, four hundred thirty-nine billion, one hundred fifty-three million, forty-one thousand, two hundred fifty-five".