21051148295473 has 4 divisors (see below), whose sum is σ = 21564590936868. Its totient is φ = 20537705654080.

The previous prime is 21051148295431. The next prime is 21051148295483. The reversal of 21051148295473 is 37459284115012.

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 9840624698529 + 11210523596944 = 3136977^2 + 3348212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21051148295473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21051148295473.

It is not an unprimeable number, because it can be changed into a prime (21051148295483) 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, 256721320636 + ... + 256721320717.

It is an arithmetic number, because the mean of its divisors is an integer number (5391147734217).

Almost surely, 2^{21051148295473} is an apocalyptic number.

It is an amenable number.

21051148295473 is a deficient number, since it is larger than the sum of its proper divisors (513442641395).

21051148295473 is an equidigital number, since it uses as much as digits as its factorization.

21051148295473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513442641394.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 21051148295473 in words is "twenty-one trillion, fifty-one billion, one hundred forty-eight million, two hundred ninety-five thousand, four hundred seventy-three".