20521161162011 has 16 divisors (see below), whose sum is σ = 20688349968000. Its totient is φ = 20354380800000.

The previous prime is 20521161162001. The next prime is 20521161162017. The reversal of 20521161162011 is 11026116112502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20521161162011 is a prime.

It is a super-2 number, since 2×20521161162011² (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 (20521161162017) 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, 420913886 + ... + 420962636.

It is an arithmetic number, because the mean of its divisors is an integer number (1293021873000).

Almost surely, 2^{20521161162011} is an apocalyptic number.

20521161162011 is a deficient number, since it is larger than the sum of its proper divisors (167188805989).

20521161162011 is a wasteful number, since it uses less digits than its factorization.

20521161162011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52870.

The product of its (nonzero) digits is 1440, while the sum is 29.

Adding to 20521161162011 its reverse (11026116112502), we get a palindrome (31547277274513).

The spelling of 20521161162011 in words is "twenty trillion, five hundred twenty-one billion, one hundred sixty-one million, one hundred sixty-two thousand, eleven".