1216220214 has 16 divisors (see below), whose sum is σ = 2653571520. Its totient is φ = 368551560.

The previous prime is 1216220167. The next prime is 1216220221. The reversal of 1216220214 is 4120226121.

It is a Curzon number.

It is a congruent number.

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, 9213724 + ... + 9213855.

It is an arithmetic number, because the mean of its divisors is an integer number (165848220).

Almost surely, 2^1216220214 is an apocalyptic number.

1216220214 is an abundant number, since it is smaller than the sum of its proper divisors (1437351306).

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

1216220214 is a wasteful number, since it uses less digits than its factorization.

1216220214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427595.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1216220214 is about 34874.3489401594. The cubic root of 1216220214 is about 1067.4250875515.

Adding to 1216220214 its reverse (4120226121), we get a palindrome (5336446335).

The spelling of 1216220214 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, two hundred fourteen".