221623016 has 16 divisors (see below), whose sum is σ = 439987140. Its totient is φ = 104293120.

The previous prime is 221622983. The next prime is 221623043. The reversal of 221623016 is 610326122.

It can be written as a sum of positive squares in 2 ways, for example, as 197514916 + 24108100 = 14054^2 + 4910^2 .

It is a super-2 number, since 2×221623016² = 98233522441872512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221622982 and 221623000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814655 + ... + 814926.

Almost surely, 2^221623016 is an apocalyptic number.

It is an amenable number.

221623016 is a deficient number, since it is larger than the sum of its proper divisors (218364124).

221623016 is a wasteful number, since it uses less digits than its factorization.

221623016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629604 (or 1629600 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 221623016 is about 14887.0082958263. The cubic root of 221623016 is about 605.1619592349.

Adding to 221623016 its reverse (610326122), we get a palindrome (831949138).

The spelling of 221623016 in words is "two hundred twenty-one million, six hundred twenty-three thousand, sixteen".