121421456 has 40 divisors (see below), whose sum is σ = 255259704. Its totient is φ = 55618560.

The previous prime is 121421453. The next prime is 121421473. The reversal of 121421456 is 654124121.

It can be written as a sum of positive squares in 4 ways, for example, as 32307856 + 89113600 = 5684^2 + 9440^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (121421453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26366 + ... + 30626.

Almost surely, 2^121421456 is an apocalyptic number.

121421456 is a gapful number since it is divisible by the number (16) 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 121421456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127629852).

121421456 is an abundant number, since it is smaller than the sum of its proper divisors (133838248).

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

121421456 is a wasteful number, since it uses less digits than its factorization.

121421456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419 (or 4413 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 121421456 is about 11019.1404383464. The cubic root of 121421456 is about 495.1823373428.

Adding to 121421456 its reverse (654124121), we get a palindrome (775545577).

The spelling of 121421456 in words is "one hundred twenty-one million, four hundred twenty-one thousand, four hundred fifty-six".