163140021 has 32 divisors (see below), whose sum is σ = 266048640. Its totient is φ = 97977600.

The previous prime is 163140013. The next prime is 163140049. The reversal of 163140021 is 120041361.

It is a happy number.

It is not a de Polignac number, because 163140021 - 2³ = 163140013 is a prime.

It is a super-2 number, since 2×163140021² = 53229332903760882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 163139976 and 163140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163140521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31131 + ... + 35991.

It is an arithmetic number, because the mean of its divisors is an integer number (8314020).

Almost surely, 2^163140021 is an apocalyptic number.

163140021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163140021 is a deficient number, since it is larger than the sum of its proper divisors (102908619).

163140021 is a wasteful number, since it uses less digits than its factorization.

163140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994 (or 4988 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 163140021 is about 12772.6278032361. The cubic root of 163140021 is about 546.4119280041.

Adding to 163140021 its reverse (120041361), we get a palindrome (283181382).

The spelling of 163140021 in words is "one hundred sixty-three million, one hundred forty thousand, twenty-one".