121643580 has 24 divisors (see below), whose sum is σ = 340602192. Its totient is φ = 32438272.

The previous prime is 121643569. The next prime is 121643593. The reversal of 121643580 is 85346121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013637 + ... + 1013756.

It is an arithmetic number, because the mean of its divisors is an integer number (14191758).

Almost surely, 2^121643580 is an apocalyptic number.

121643580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121643580 is an abundant number, since it is smaller than the sum of its proper divisors (218958612).

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

121643580 is a wasteful number, since it uses less digits than its factorization.

121643580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027405 (or 2027403 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 121643580 is about 11029.2148405950. The cubic root of 121643580 is about 495.4841095927.

The spelling of 121643580 in words is "one hundred twenty-one million, six hundred forty-three thousand, five hundred eighty".