12221530 has 16 divisors (see below), whose sum is σ = 22063104. Its totient is φ = 4874320.

The previous prime is 12221527. The next prime is 12221543. The reversal of 12221530 is 3512221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2235 + ... + 5425.

It is an arithmetic number, because the mean of its divisors is an integer number (1378944).

Almost surely, 2^12221530 is an apocalyptic number.

12221530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221530 is a deficient number, since it is larger than the sum of its proper divisors (9841574).

12221530 is a wasteful number, since it uses less digits than its factorization.

12221530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12221530 is about 3495.9304912998. The cubic root of 12221530 is about 230.3430922378.

Adding to 12221530 its reverse (3512221), we get a palindrome (15733751).

The spelling of 12221530 in words is "twelve million, two hundred twenty-one thousand, five hundred thirty".