21507536211011 has 16 divisors (see below), whose sum is σ = 22815638626464. Its totient is φ = 20204214288384.

The previous prime is 21507536210959. The next prime is 21507536211017. The reversal of 21507536211011 is 11011263570512.

It is a cyclic number.

It is not a de Polignac number, because 21507536211011 - 2¹⁸ = 21507535948867 is a prime.

It is a super-2 number, since 2×21507536211011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21507536211017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90547475 + ... + 90784691.

It is an arithmetic number, because the mean of its divisors is an integer number (1425977414154).

Almost surely, 2^{21507536211011} is an apocalyptic number.

21507536211011 is a deficient number, since it is larger than the sum of its proper divisors (1308102415453).

21507536211011 is a wasteful number, since it uses less digits than its factorization.

21507536211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247270.

The product of its (nonzero) digits is 12600, while the sum is 35.

Adding to 21507536211011 its reverse (11011263570512), we get a palindrome (32518799781523).

The spelling of 21507536211011 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-six million, two hundred eleven thousand, eleven".