21010441345 has 16 divisors (see below), whose sum is σ = 26152296192. Its totient is φ = 16192552320.

The previous prime is 21010441343. The next prime is 21010441351. The reversal of 21010441345 is 54314401012.

It is not a de Polignac number, because 21010441345 - 2¹ = 21010441343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010441343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653641 + ... + 685030.

It is an arithmetic number, because the mean of its divisors is an integer number (1634518512).

Almost surely, 2^21010441345 is an apocalyptic number.

It is an amenable number.

21010441345 is a deficient number, since it is larger than the sum of its proper divisors (5141854847).

21010441345 is a wasteful number, since it uses less digits than its factorization.

21010441345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338792.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21010441345 its reverse (54314401012), we get a palindrome (75324842357).

The spelling of 21010441345 in words is "twenty-one billion, ten million, four hundred forty-one thousand, three hundred forty-five".