1221708000 has 192 divisors, whose sum is σ = 4070364480. Its totient is φ = 320256000.

The previous prime is 1221707987. The next prime is 1221708013. The reversal of 1221708000 is 8071221.

It is an interprime number because it is at equal distance from previous prime (1221707987) and next prime (1221708013).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 731166 + ... + 732834.

It is an arithmetic number, because the mean of its divisors is an integer number (21199815).

Almost surely, 2^1221708000 is an apocalyptic number.

1221708000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221708000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035182240).

1221708000 is an abundant number, since it is smaller than the sum of its proper divisors (2848656480).

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

1221708000 is a wasteful number, since it uses less digits than its factorization.

1221708000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1221708000 is about 34952.9397905241. The cubic root of 1221708000 is about 1069.0281448351.

Adding to 1221708000 its reverse (8071221), we get a palindrome (1229779221).

The spelling of 1221708000 in words is "one billion, two hundred twenty-one million, seven hundred eight thousand".