163121020 has 48 divisors (see below), whose sum is σ = 353646720. Its totient is φ = 63166464.

The previous prime is 163120999. The next prime is 163121029. The reversal of 163121020 is 20121361.

It is a junction number, because it is equal to n+sod(n) for n = 163120985 and 163121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163121029) 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, 90286 + ... + 92074.

It is an arithmetic number, because the mean of its divisors is an integer number (7367640).

Almost surely, 2^163121020 is an apocalyptic number.

163121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163121020 is an abundant number, since it is smaller than the sum of its proper divisors (190525700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163121020 is a wasteful number, since it uses less digits than its factorization.

163121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 163121020 is about 12771.8839643962. The cubic root of 163121020 is about 546.3907135567.

Adding to 163121020 its reverse (20121361), we get a palindrome (183242381).

The spelling of 163121020 in words is "one hundred sixty-three million, one hundred twenty-one thousand, twenty".