21354462593 has 8 divisors (see below), whose sum is σ = 21389569128. Its totient is φ = 21319387264.

The previous prime is 21354462589. The next prime is 21354462607. The reversal of 21354462593 is 39526445312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11597566864 + 9756895729 = 107692^2 + 98777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21354462593 - 2² = 21354462589 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354462293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631471 + ... + 1644507.

It is an arithmetic number, because the mean of its divisors is an integer number (2673696141).

Almost surely, 2^21354462593 is an apocalyptic number.

It is an amenable number.

21354462593 is a deficient number, since it is larger than the sum of its proper divisors (35106535).

21354462593 is a wasteful number, since it uses less digits than its factorization.

21354462593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15603.

The product of its digits is 777600, while the sum is 44.

The spelling of 21354462593 in words is "twenty-one billion, three hundred fifty-four million, four hundred sixty-two thousand, five hundred ninety-three".