21435410545 has 8 divisors (see below), whose sum is σ = 25724845224. Its totient is φ = 17146760064.

The previous prime is 21435410543. The next prime is 21435410611. The reversal of 21435410545 is 54501453412.

It can be written as a sum of positive squares in 4 ways, for example, as 2028691681 + 19406718864 = 45041^2 + 139308^2 .

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 21435410545 - 2¹ = 21435410543 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 21435410545.

It is not an unprimeable number, because it can be changed into a prime (21435410543) 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 7 ways as a sum of consecutive naturals, for example, 134134 + ... + 246703.

It is an arithmetic number, because the mean of its divisors is an integer number (3215605653).

Almost surely, 2^21435410545 is an apocalyptic number.

It is an amenable number.

21435410545 is a deficient number, since it is larger than the sum of its proper divisors (4289434679).

21435410545 is a wasteful number, since it uses less digits than its factorization.

21435410545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392099.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21435410545 its reverse (54501453412), we get a palindrome (75936863957).

The spelling of 21435410545 in words is "twenty-one billion, four hundred thirty-five million, four hundred ten thousand, five hundred forty-five".