221690073 has 8 divisors (see below), whose sum is σ = 322458336. Its totient is φ = 134357600.

The previous prime is 221690041. The next prime is 221690087. The reversal of 221690073 is 370096122.

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 221690073 - 2⁵ = 221690041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221690073.

It is not an unprimeable number, because it can be changed into a prime (221690003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3358908 + ... + 3358973.

It is an arithmetic number, because the mean of its divisors is an integer number (40307292).

Almost surely, 2^221690073 is an apocalyptic number.

It is an amenable number.

221690073 is a deficient number, since it is larger than the sum of its proper divisors (100768263).

221690073 is a wasteful number, since it uses less digits than its factorization.

221690073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6717895.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 221690073 is about 14889.2603241397. The cubic root of 221690073 is about 605.2229881751. Note that the first 3 decimals are identical.

The spelling of 221690073 in words is "two hundred twenty-one million, six hundred ninety thousand, seventy-three".