1221652160 has 56 divisors (see below), whose sum is σ = 2923976880. Its totient is φ = 486155264.

The previous prime is 1221652151. The next prime is 1221652169. The reversal of 1221652160 is 612561221.

It is an interprime number because it is at equal distance from previous prime (1221652151) and next prime (1221652169).

It is not an unprimeable number, because it can be changed into a prime (1221652169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53351 + ... + 72729.

Almost surely, 2^1221652160 is an apocalyptic number.

1221652160 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 1221652160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461988440).

1221652160 is an abundant number, since it is smaller than the sum of its proper divisors (1702324720).

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

1221652160 is a wasteful number, since it uses less digits than its factorization.

1221652160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19593 (or 19583 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1221652160 is about 34952.1409930779. The cubic root of 1221652160 is about 1069.0118574077.

The spelling of 1221652160 in words is "one billion, two hundred twenty-one million, six hundred fifty-two thousand, one hundred sixty".