21245095369 has 4 divisors (see below), whose sum is σ = 21246060420. Its totient is φ = 21244130320.

The previous prime is 21245095363. The next prime is 21245095373. The reversal of 21245095369 is 96359054212.

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 11372089600 + 9873005769 = 106640^2 + 99363^2 .

It is a cyclic number.

It is not a de Polignac number, because 21245095369 - 2²³ = 21236706761 is a prime.

It is a super-2 number, since 2×21245095369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21245095363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448714 + ... + 493795.

It is an arithmetic number, because the mean of its divisors is an integer number (5311515105).

Almost surely, 2^21245095369 is an apocalyptic number.

It is an amenable number.

21245095369 is a deficient number, since it is larger than the sum of its proper divisors (965051).

21245095369 is an equidigital number, since it uses as much as digits as its factorization.

21245095369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965050.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 21245095369 in words is "twenty-one billion, two hundred forty-five million, ninety-five thousand, three hundred sixty-nine".