1221041214 has 24 divisors (see below), whose sum is σ = 2646379632. Its totient is φ = 406892160.

The previous prime is 1221041179. The next prime is 1221041219. The reversal of 1221041214 is 4121401221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221041219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68142 + ... + 84174.

It is an arithmetic number, because the mean of its divisors is an integer number (110265818).

Almost surely, 2^1221041214 is an apocalyptic number.

1221041214 is an abundant number, since it is smaller than the sum of its proper divisors (1425338418).

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

1221041214 is a wasteful number, since it uses less digits than its factorization.

1221041214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20272 (or 20269 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1221041214 is about 34943.4001493844. The cubic root of 1221041214 is about 1068.8336240712.

Adding to 1221041214 its reverse (4121401221), we get a palindrome (5342442435).

The spelling of 1221041214 in words is "one billion, two hundred twenty-one million, forty-one thousand, two hundred fourteen".