21050083513369 has 9 divisors (see below), whose sum is σ = 21634555408221. Its totient is φ = 20480997168000.

The previous prime is 21050083513357. The next prime is 21050083513379. The reversal of 21050083513369 is 96331538005012.

The square root of 21050083513369 is 4588037.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 780386726025 + 20269696787344 = 883395^2 + 4502188^2 .

It is not a de Polignac number, because 21050083513369 - 2¹⁹ = 21050082989081 is a prime.

It is a super-2 number, since 2×21050083513369² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050083513379) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 169695369 + ... + 169819369.

Almost surely, 2^{21050083513369} is an apocalyptic number.

21050083513369 is the 4588037-th square number.

21050083513369 is the 2294019-th centered octagonal number.

It is an amenable number.

21050083513369 is a deficient number, since it is larger than the sum of its proper divisors (584471894852).

21050083513369 is an frugal number, since it uses more digits than its factorization.

21050083513369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248076 (or 124038 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 21050083513369 in words is "twenty-one trillion, fifty billion, eighty-three million, five hundred thirteen thousand, three hundred sixty-nine".