121573564 has 48 divisors (see below), whose sum is σ = 251274240. Its totient is φ = 50379840.

The previous prime is 121573559. The next prime is 121573603. The reversal of 121573564 is 465375121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247359 + ... + 247849.

It is an arithmetic number, because the mean of its divisors is an integer number (5234880).

Almost surely, 2^121573564 is an apocalyptic number.

121573564 is a gapful number since it is divisible by the number (14) 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 121573564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125637120).

121573564 is an abundant number, since it is smaller than the sum of its proper divisors (129700676).

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

121573564 is a wasteful number, since it uses less digits than its factorization.

121573564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 776 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 121573564 is about 11026.0402683828. The cubic root of 121573564 is about 495.3890272394.

The spelling of 121573564 in words is "one hundred twenty-one million, five hundred seventy-three thousand, five hundred sixty-four".