163221512 has 32 divisors (see below), whose sum is σ = 319901400. Its totient is φ = 77973504.

The previous prime is 163221491. The next prime is 163221523. The reversal of 163221512 is 215122361.

It can be written as a sum of positive squares in 4 ways, for example, as 150160516 + 13060996 = 12254^2 + 3614^2 .

It is a super-2 number, since 2×163221512² = 53282523959132288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18878 + ... + 26130.

Almost surely, 2^163221512 is an apocalyptic number.

It is an amenable number.

163221512 is a deficient number, since it is larger than the sum of its proper divisors (156679888).

163221512 is a wasteful number, since it uses less digits than its factorization.

163221512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385 (or 7381 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 163221512 is about 12775.8174689528. The cubic root of 163221512 is about 546.5028933031.

Adding to 163221512 its reverse (215122361), we get a palindrome (378343873).

The spelling of 163221512 in words is "one hundred sixty-three million, two hundred twenty-one thousand, five hundred twelve".