121421400 has 96 divisors (see below), whose sum is σ = 396254400. Its totient is φ = 30672000.

The previous prime is 121421369. The next prime is 121421413. The reversal of 121421400 is 4124121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121421400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6075 + ... + 16725.

It is an arithmetic number, because the mean of its divisors is an integer number (4127650).

Almost surely, 2^121421400 is an apocalyptic number.

121421400 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 121421400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198127200).

121421400 is an abundant number, since it is smaller than the sum of its proper divisors (274833000).

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

121421400 is a wasteful number, since it uses less digits than its factorization.

121421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10689 (or 10680 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 121421400 is about 11019.1378973130. The cubic root of 121421400 is about 495.1822612162.

Adding to 121421400 its reverse (4124121), we get a palindrome (125545521).

The spelling of 121421400 in words is "one hundred twenty-one million, four hundred twenty-one thousand, four hundred".