21474670255 has 4 divisors (see below), whose sum is σ = 25769604312. Its totient is φ = 17179736200.

The previous prime is 21474670253. The next prime is 21474670279. The reversal of 21474670255 is 55207647412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21474670255 - 2¹ = 21474670253 is a prime.

It is a super-2 number, since 2×21474670255² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474670253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2147467021 + ... + 2147467030.

It is an arithmetic number, because the mean of its divisors is an integer number (6442401078).

Almost surely, 2^21474670255 is an apocalyptic number.

21474670255 is a deficient number, since it is larger than the sum of its proper divisors (4294934057).

21474670255 is an equidigital number, since it uses as much as digits as its factorization.

21474670255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294934056.

The product of its (nonzero) digits is 470400, while the sum is 43.

The spelling of 21474670255 in words is "twenty-one billion, four hundred seventy-four million, six hundred seventy thousand, two hundred fifty-five".