21050044340253 has 16 divisors (see below), whose sum is σ = 28187663003136. Its totient is φ = 13972896334080.

The previous prime is 21050044340167. The next prime is 21050044340257. The reversal of 21050044340253 is 35204344005012.

It is not a de Polignac number, because 21050044340253 - 2²⁰ = 21050043291677 is a prime.

It is a super-2 number, since 2×21050044340253² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050044340257) 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 15 ways as a sum of consecutive naturals, for example, 47175033 + ... + 47619153.

It is an arithmetic number, because the mean of its divisors is an integer number (1761728937696).

Almost surely, 2^{21050044340253} is an apocalyptic number.

It is an amenable number.

21050044340253 is a deficient number, since it is larger than the sum of its proper divisors (7137618662883).

21050044340253 is a wasteful number, since it uses less digits than its factorization.

21050044340253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512164.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 21050044340253 its reverse (35204344005012), we get a palindrome (56254388345265).

The spelling of 21050044340253 in words is "twenty-one trillion, fifty billion, forty-four million, three hundred forty thousand, two hundred fifty-three".