221616970 has 8 divisors (see below), whose sum is σ = 398910564. Its totient is φ = 88646784.

The previous prime is 221616959. The next prime is 221616973. The reversal of 221616970 is 79616122.

It can be written as a sum of positive squares in 2 ways, for example, as 210917529 + 10699441 = 14523^2 + 3271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221616970² = 98228162783961800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221616973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11080839 + ... + 11080858.

Almost surely, 2^221616970 is an apocalyptic number.

221616970 is a deficient number, since it is larger than the sum of its proper divisors (177293594).

221616970 is a wasteful number, since it uses less digits than its factorization.

221616970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22161704.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 221616970 is about 14886.8052314793. The cubic root of 221616970 is about 605.1564561325.

The spelling of 221616970 in words is "two hundred twenty-one million, six hundred sixteen thousand, nine hundred seventy".