121666524210 has 288 divisors, whose sum is σ = 402373101312. Its totient is φ = 25222095360.

The previous prime is 121666524181. The next prime is 121666524227. The reversal of 121666524210 is 12425666121.

It is a super-2 number, since 2×121666524210² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 22457422 + ... + 22462838.

It is an arithmetic number, because the mean of its divisors is an integer number (1397128824).

Almost surely, 2^121666524210 is an apocalyptic number.

121666524210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121666524210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201186550656).

121666524210 is an abundant number, since it is smaller than the sum of its proper divisors (280706577102).

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

121666524210 is a wasteful number, since it uses less digits than its factorization.

121666524210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918 (or 5908 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 121666524210 in words is "one hundred twenty-one billion, six hundred sixty-six million, five hundred twenty-four thousand, two hundred ten".