20521161162007 has 4 divisors (see below), whose sum is σ = 22386721267656. Its totient is φ = 18655601056360.

The previous prime is 20521161162001. The next prime is 20521161162017. The reversal of 20521161162007 is 70026116112502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20521161162007 - 2²³ = 20521152773399 is a prime.

It is a super-2 number, since 2×20521161162007² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521161162001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932780052808 + ... + 932780052829.

It is an arithmetic number, because the mean of its divisors is an integer number (5596680316914).

Almost surely, 2^{20521161162007} is an apocalyptic number.

20521161162007 is a deficient number, since it is larger than the sum of its proper divisors (1865560105649).

20521161162007 is a wasteful number, since it uses less digits than its factorization.

20521161162007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865560105648.

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 20521161162007 its reverse (70026116112502), we get a palindrome (90547277274509).

It can be divided in two parts, 2052116 and 1162007, that added together give a palindrome (3214123).

The spelling of 20521161162007 in words is "twenty trillion, five hundred twenty-one billion, one hundred sixty-one million, one hundred sixty-two thousand, seven".