121002420 has 144 divisors (see below), whose sum is σ = 425787264. Its totient is φ = 25132800.

The previous prime is 121002407. The next prime is 121002433. The reversal of 121002420 is 24200121.

It is an interprime number because it is at equal distance from previous prime (121002407) and next prime (121002433).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121002396 and 121002405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49630 + ... + 52010.

It is an arithmetic number, because the mean of its divisors is an integer number (2956856).

Almost surely, 2^121002420 is an apocalyptic number.

121002420 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 121002420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212893632).

121002420 is an abundant number, since it is smaller than the sum of its proper divisors (304784844).

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

121002420 is a wasteful number, since it uses less digits than its factorization.

121002420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 121002420 is about 11000.1099994500. The cubic root of 121002420 is about 494.6120416945.

Adding to 121002420 its reverse (24200121), we get a palindrome (145202541).

The spelling of 121002420 in words is "one hundred twenty-one million, two thousand, four hundred twenty".