121287420 has 144 divisors (see below), whose sum is σ = 380933280. Its totient is φ = 31223808.

The previous prime is 121287409. The next prime is 121287427. The reversal of 121287420 is 24782121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121287427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1073284 + ... + 1073396.

It is an arithmetic number, because the mean of its divisors is an integer number (2645370).

Almost surely, 2^121287420 is an apocalyptic number.

121287420 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 121287420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190466640).

121287420 is an abundant number, since it is smaller than the sum of its proper divisors (259645860).

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

121287420 is a wasteful number, since it uses less digits than its factorization.

121287420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 121287420 is about 11013.0567963668. The cubic root of 121287420 is about 495.0000612182. Note that the first 4 decimals are identical.

The spelling of 121287420 in words is "one hundred twenty-one million, two hundred eighty-seven thousand, four hundred twenty".