21315454174411 has 4 divisors (see below), whose sum is σ = 21315478866192. Its totient is φ = 21315429482632.

The previous prime is 21315454174393. The next prime is 21315454174489. The reversal of 21315454174411 is 11447145451312.

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

It is a cyclic number.

It is not a de Polignac number, because 21315454174411 - 2⁹ = 21315454173899 is a prime.

It is a super-2 number, since 2×21315454174411² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21315454174111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11002255 + ... + 12793768.

It is an arithmetic number, because the mean of its divisors is an integer number (5328869716548).

Almost surely, 2^{21315454174411} is an apocalyptic number.

21315454174411 is a deficient number, since it is larger than the sum of its proper divisors (24691781).

21315454174411 is an equidigital number, since it uses as much as digits as its factorization.

21315454174411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24691780.

The product of its digits is 268800, while the sum is 43.

The spelling of 21315454174411 in words is "twenty-one trillion, three hundred fifteen billion, four hundred fifty-four million, one hundred seventy-four thousand, four hundred eleven".