221690737 has 8 divisors (see below), whose sum is σ = 223620992. Its totient is φ = 219769200.

The previous prime is 221690713. The next prime is 221690743. The reversal of 221690737 is 737096122.

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

It is a cyclic number.

It is not a de Polignac number, because 221690737 - 2¹¹ = 221688689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221690696 and 221690705.

It is not an unprimeable number, because it can be changed into a prime (221690137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55243 + ... + 59119.

It is an arithmetic number, because the mean of its divisors is an integer number (27952624).

Almost surely, 2^221690737 is an apocalyptic number.

It is an amenable number.

221690737 is a deficient number, since it is larger than the sum of its proper divisors (1930255).

221690737 is a wasteful number, since it uses less digits than its factorization.

221690737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 221690737 is about 14889.2826220742. The cubic root of 221690737 is about 605.2235924235.

The spelling of 221690737 in words is "two hundred twenty-one million, six hundred ninety thousand, seven hundred thirty-seven".