121863420 has 192 divisors, whose sum is σ = 438896640. Its totient is φ = 27495936.

The previous prime is 121863403. The next prime is 121863431. The reversal of 121863420 is 24368121.

121863420 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 634 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 389184 + ... + 389496.

It is an arithmetic number, because the mean of its divisors is an integer number (2285920).

Almost surely, 2^121863420 is an apocalyptic number.

121863420 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 121863420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219448320).

121863420 is an abundant number, since it is smaller than the sum of its proper divisors (317033220).

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

121863420 is a wasteful number, since it uses less digits than its factorization.

121863420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 121863420 is about 11039.1765997288. The cubic root of 121863420 is about 495.7824173565.

The spelling of 121863420 in words is "one hundred twenty-one million, eight hundred sixty-three thousand, four hundred twenty".