21214035644465 has 8 divisors (see below), whose sum is σ = 25463721164328. Its totient is φ = 16966642921600.

The previous prime is 21214035644453. The next prime is 21214035644507. The reversal of 21214035644465 is 56444653041212.

It can be written as a sum of positive squares in 4 ways, for example, as 63023089936 + 21151012554529 = 251044^2 + 4599023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21214035644465 - 2⁸ = 21214035644209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 573178892 + ... + 573215901.

It is an arithmetic number, because the mean of its divisors is an integer number (3182965145541).

Almost surely, 2^{21214035644465} is an apocalyptic number.

It is an amenable number.

21214035644465 is a deficient number, since it is larger than the sum of its proper divisors (4249685519863).

21214035644465 is a wasteful number, since it uses less digits than its factorization.

21214035644465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146398499.

The product of its (nonzero) digits is 2764800, while the sum is 47.

Adding to 21214035644465 its reverse (56444653041212), we get a palindrome (77658688685677).

The spelling of 21214035644465 in words is "twenty-one trillion, two hundred fourteen billion, thirty-five million, six hundred forty-four thousand, four hundred sixty-five".