21005515341 has 12 divisors (see below), whose sum is σ = 31938210720. Its totient is φ = 13266641160.

The previous prime is 21005515319. The next prime is 21005515361. The reversal of 21005515341 is 14351550012.

21005515341 is a `hidden beast` number, since 2 + 100 + 5 + 515 + 3 + 41 = 666.

It is not a de Polignac number, because 21005515341 - 2¹⁰ = 21005514317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005515301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61419465 + ... + 61419806.

It is an arithmetic number, because the mean of its divisors is an integer number (2661517560).

Almost surely, 2^21005515341 is an apocalyptic number.

It is an amenable number.

21005515341 is a deficient number, since it is larger than the sum of its proper divisors (10932695379).

21005515341 is a wasteful number, since it uses less digits than its factorization.

21005515341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122839296 (or 122839293 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 21005515341 in words is "twenty-one billion, five million, five hundred fifteen thousand, three hundred forty-one".