21470245493 has 2 divisors, whose sum is σ = 21470245494. Its totient is φ = 21470245492.

The previous prime is 21470245487. The next prime is 21470245529. The reversal of 21470245493 is 39454207412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11156218129 + 10314027364 = 105623^2 + 101558^2 .

It is a cyclic number.

It is not a de Polignac number, because 21470245493 - 2⁶ = 21470245429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21470245493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21470245403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735122746 + 10735122747.

It is an arithmetic number, because the mean of its divisors is an integer number (10735122747).

Almost surely, 2^21470245493 is an apocalyptic number.

It is an amenable number.

21470245493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470245493 is an equidigital number, since it uses as much as digits as its factorization.

21470245493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21470245493 in words is "twenty-one billion, four hundred seventy million, two hundred forty-five thousand, four hundred ninety-three".