221455023 has 8 divisors (see below), whose sum is σ = 301555968. Its totient is φ = 144495384.

The previous prime is 221455021. The next prime is 221455037. The reversal of 221455023 is 320554122.

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

It is not a de Polignac number, because 221455023 - 2¹ = 221455021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221454984 and 221455002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221455021) 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, 785161 + ... + 785442.

It is an arithmetic number, because the mean of its divisors is an integer number (37694496).

Almost surely, 2^221455023 is an apocalyptic number.

221455023 is a deficient number, since it is larger than the sum of its proper divisors (80100945).

221455023 is a wasteful number, since it uses less digits than its factorization.

221455023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570653.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 221455023 is about 14881.3649575568. The cubic root of 221455023 is about 605.0090138219.

Subtracting 221455023 from its reverse (320554122), we obtain a palindrome (99099099).

The spelling of 221455023 in words is "two hundred twenty-one million, four hundred fifty-five thousand, twenty-three".