221430153 has 8 divisors (see below), whose sum is σ = 337417408. Its totient is φ = 126531504.

The previous prime is 221430149. The next prime is 221430169. The reversal of 221430153 is 351034122.

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

It is not a de Polignac number, because 221430153 - 2² = 221430149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10544293 = 221430153 / (2 + 2 + 1 + 4 + 3 + 0 + 1 + 5 + 3).

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (221430103) 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, 5272126 + ... + 5272167.

It is an arithmetic number, because the mean of its divisors is an integer number (42177176).

Almost surely, 2^221430153 is an apocalyptic number.

It is an amenable number.

221430153 is a deficient number, since it is larger than the sum of its proper divisors (115987255).

221430153 is a wasteful number, since it uses less digits than its factorization.

221430153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10544303.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221430153 is about 14880.5293252626. The cubic root of 221430153 is about 604.9863649228.

Adding to 221430153 its reverse (351034122), we get a palindrome (572464275).

The spelling of 221430153 in words is "two hundred twenty-one million, four hundred thirty thousand, one hundred fifty-three".