21445077293 has 4 divisors (see below), whose sum is σ = 21581670300. Its totient is φ = 21308484288.

The previous prime is 21445077259. The next prime is 21445077299. The reversal of 21445077293 is 39277054412.

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 3236813449 + 18208263844 = 56893^2 + 134938^2 .

It is a cyclic number.

It is not a de Polignac number, because 21445077293 - 2¹⁰ = 21445076269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445077299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68296268 + ... + 68296581.

It is an arithmetic number, because the mean of its divisors is an integer number (5395417575).

Almost surely, 2^21445077293 is an apocalyptic number.

It is an amenable number.

21445077293 is a deficient number, since it is larger than the sum of its proper divisors (136593007).

21445077293 is a wasteful number, since it uses less digits than its factorization.

21445077293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136593006.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 21445077293 in words is "twenty-one billion, four hundred forty-five million, seventy-seven thousand, two hundred ninety-three".