221790106 has 8 divisors (see below), whose sum is σ = 335915424. Its totient is φ = 109818300.

The previous prime is 221790103. The next prime is 221790113. The reversal of 221790106 is 601097122.

It is a happy number.

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

It is a super-2 number, since 2×221790106² = 98381702238982472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221790103) 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, 538120 + ... + 538531.

It is an arithmetic number, because the mean of its divisors is an integer number (41989428).

Almost surely, 2^221790106 is an apocalyptic number.

221790106 is a deficient number, since it is larger than the sum of its proper divisors (114125318).

221790106 is a wasteful number, since it uses less digits than its factorization.

221790106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076756.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 221790106 is about 14892.6191786401. The cubic root of 221790106 is about 605.3140058836.

The spelling of 221790106 in words is "two hundred twenty-one million, seven hundred ninety thousand, one hundred six".