221215330 has 16 divisors (see below), whose sum is σ = 455071680. Its totient is φ = 75845232.

The previous prime is 221215327. The next prime is 221215333. The reversal of 221215330 is 33512122.

It is an interprime number because it is at equal distance from previous prime (221215327) and next prime (221215333).

It is a junction number, because it is equal to n+sod(n) for n = 221215298 and 221215307.

It is not an unprimeable number, because it can be changed into a prime (221215333) 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, 1580040 + ... + 1580179.

It is an arithmetic number, because the mean of its divisors is an integer number (28441980).

Almost surely, 2^221215330 is an apocalyptic number.

221215330 is an abundant number, since it is smaller than the sum of its proper divisors (233856350).

221215330 is a wasteful number, since it uses less digits than its factorization.

221215330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160233.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 221215330 is about 14873.3093156836. The cubic root of 221215330 is about 604.7906568017.

Adding to 221215330 its reverse (33512122), we get a palindrome (254727452).

The spelling of 221215330 in words is "two hundred twenty-one million, two hundred fifteen thousand, three hundred thirty".