21214035644305 has 48 divisors (see below), whose sum is σ = 31365803359440. Its totient is φ = 13686360834048.

The previous prime is 21214035644293. The next prime is 21214035644341. The reversal of 21214035644305 is 50344653041212.

It can be written as a sum of positive squares in 8 ways, for example, as 30256167249 + 21183779477056 = 173943^2 + 4602584^2 .

It is not a de Polignac number, because 21214035644305 - 2⁹ = 21214035643793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11240529 + ... + 12991441.

It is an arithmetic number, because the mean of its divisors is an integer number (653454236655).

Almost surely, 2^{21214035644305} is an apocalyptic number.

It is an amenable number.

21214035644305 is a deficient number, since it is larger than the sum of its proper divisors (10151767715135).

21214035644305 is a wasteful number, since it uses less digits than its factorization.

21214035644305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753858 (or 1753851 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21214035644305 its reverse (50344653041212), we get a palindrome (71558688685517).

The spelling of 21214035644305 in words is "twenty-one trillion, two hundred fourteen billion, thirty-five million, six hundred forty-four thousand, three hundred five".