221998071 has 8 divisors (see below), whose sum is σ = 311576320. Its totient is φ = 140209272.

The previous prime is 221998069. The next prime is 221998081. The reversal of 221998071 is 170899122.

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

It is not a de Polignac number, because 221998071 - 2¹ = 221998069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221998031) 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, 1947295 + ... + 1947408.

It is an arithmetic number, because the mean of its divisors is an integer number (38947040).

Almost surely, 2^221998071 is an apocalyptic number.

221998071 is a deficient number, since it is larger than the sum of its proper divisors (89578249).

221998071 is a wasteful number, since it uses less digits than its factorization.

221998071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894725.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 221998071 is about 14899.5996926092. The cubic root of 221998071 is about 605.5031408638.

The spelling of 221998071 in words is "two hundred twenty-one million, nine hundred ninety-eight thousand, seventy-one".