221221023 has 8 divisors (see below), whose sum is σ = 295183536. Its totient is φ = 147369600.

The previous prime is 221220997. The next prime is 221221037. The reversal of 221221023 is 320122122.

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 221221023 - 2⁶ = 221220959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221220993 and 221221011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221073) 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, 23008 + ... + 31173.

It is an arithmetic number, because the mean of its divisors is an integer number (36897942).

Almost surely, 2^221221023 is an apocalyptic number.

221221023 is a deficient number, since it is larger than the sum of its proper divisors (73962513).

221221023 is a wasteful number, since it uses less digits than its factorization.

221221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55545.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221221023 is about 14873.5006975493. The cubic root of 221221023 is about 604.7958448745.

Adding to 221221023 its reverse (320122122), we get a palindrome (541343145).

The spelling of 221221023 in words is "two hundred twenty-one million, two hundred twenty-one thousand, twenty-three".