1221196914 has 144 divisors (see below), whose sum is σ = 3300568128. Its totient is φ = 324523584.

The previous prime is 1221196913. The next prime is 1221196957. The reversal of 1221196914 is 4196911221.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221196913) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 749769 + ... + 751395.

It is an arithmetic number, because the mean of its divisors is an integer number (22920612).

Almost surely, 2^1221196914 is an apocalyptic number.

1221196914 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221196914, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650284064).

1221196914 is an abundant number, since it is smaller than the sum of its proper divisors (2079371214).

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

1221196914 is a wasteful number, since it uses less digits than its factorization.

1221196914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709 (or 1699 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1221196914 is about 34945.6279668859. The cubic root of 1221196914 is about 1068.8790526012.

It can be divided in two parts, 1221 and 196914, that added together give a triangular number (198135 = T₆₂₉).

The spelling of 1221196914 in words is "one billion, two hundred twenty-one million, one hundred ninety-six thousand, nine hundred fourteen".