521220001161 has 16 divisors (see below), whose sum is σ = 697828500864. Its totient is φ = 346047878784.

The previous prime is 521220001151. The next prime is 521220001187. The reversal of 521220001161 is 161100022125.

It is not a de Polignac number, because 521220001161 - 2⁶ = 521220001097 is a prime.

It is a super-2 number, since 2×521220001161² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521220001151) 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, 717100 + ... + 1247666.

It is an arithmetic number, because the mean of its divisors is an integer number (43614281304).

Almost surely, 2^521220001161 is an apocalyptic number.

It is an amenable number.

521220001161 is a deficient number, since it is larger than the sum of its proper divisors (176608499703).

521220001161 is a wasteful number, since it uses less digits than its factorization.

521220001161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531920.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 521220001161 its reverse (161100022125), we get a palindrome (682320023286).

The spelling of 521220001161 in words is "five hundred twenty-one billion, two hundred twenty million, one thousand, one hundred sixty-one".