221022651 has 8 divisors (see below), whose sum is σ = 294775360. Its totient is φ = 147309192.

The previous prime is 221022647. The next prime is 221022701. The reversal of 221022651 is 156220122.

It is a happy number.

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

It is not a de Polignac number, because 221022651 - 2² = 221022647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221022631) 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, 7896 + ... + 22458.

It is an arithmetic number, because the mean of its divisors is an integer number (36846920).

Almost surely, 2^221022651 is an apocalyptic number.

221022651 is a deficient number, since it is larger than the sum of its proper divisors (73752709).

221022651 is a wasteful number, since it uses less digits than its factorization.

221022651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19625.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 221022651 is about 14866.8305633716. The cubic root of 221022651 is about 604.6150145017.

Adding to 221022651 its reverse (156220122), we get a palindrome (377242773).

It can be divided in two parts, 22102 and 2651, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 221022651 in words is "two hundred twenty-one million, twenty-two thousand, six hundred fifty-one".