1216621230 has 32 divisors (see below), whose sum is σ = 3185336448. Its totient is φ = 294938400.

The previous prime is 1216621193. The next prime is 1216621277. The reversal of 1216621230 is 321266121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216621230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1843036 + ... + 1843695.

It is an arithmetic number, because the mean of its divisors is an integer number (99541764).

Almost surely, 2^1216621230 is an apocalyptic number.

1216621230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216621230 is an abundant number, since it is smaller than the sum of its proper divisors (1968715218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216621230 is a wasteful number, since it uses less digits than its factorization.

1216621230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686752.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1216621230 is about 34880.0979069727. The cubic root of 1216621230 is about 1067.5423929255.

Adding to 1216621230 its reverse (321266121), we get a palindrome (1537887351).

The spelling of 1216621230 in words is "one billion, two hundred sixteen million, six hundred twenty-one thousand, two hundred thirty".