21426011464345 has 4 divisors (see below), whose sum is σ = 25711213757220. Its totient is φ = 17140809171472.

The previous prime is 21426011464331. The next prime is 21426011464349. The reversal of 21426011464345 is 54346411062412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14849022954249 + 6576988510096 = 3853443^2 + 2564564^2 .

It is a cyclic number.

It is not a de Polignac number, because 21426011464345 - 2²⁷ = 21425877246617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21426011464349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142601146430 + ... + 2142601146439.

It is an arithmetic number, because the mean of its divisors is an integer number (6427803439305).

Almost surely, 2^{21426011464345} is an apocalyptic number.

It is an amenable number.

21426011464345 is a deficient number, since it is larger than the sum of its proper divisors (4285202292875).

21426011464345 is an equidigital number, since it uses as much as digits as its factorization.

21426011464345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285202292874.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 21426011464345 in words is "twenty-one trillion, four hundred twenty-six billion, eleven million, four hundred sixty-four thousand, three hundred forty-five".