121642140 has 96 divisors (see below), whose sum is σ = 372363264. Its totient is φ = 29537280.

The previous prime is 121642139. The next prime is 121642151. The reversal of 121642140 is 41246121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29697 + ... + 33543.

It is an arithmetic number, because the mean of its divisors is an integer number (3878784).

Almost surely, 2^121642140 is an apocalyptic number.

121642140 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 121642140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186181632).

121642140 is an abundant number, since it is smaller than the sum of its proper divisors (250721124).

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

121642140 is a wasteful number, since it uses less digits than its factorization.

121642140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907 (or 3905 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 121642140 is about 11029.1495592362. The cubic root of 121642140 is about 495.4821544273.

Adding to 121642140 its reverse (41246121), we get a palindrome (162888261).

The spelling of 121642140 in words is "one hundred twenty-one million, six hundred forty-two thousand, one hundred forty".