121321420 has 24 divisors (see below), whose sum is σ = 277936848. Its totient is φ = 44116800.

The previous prime is 121321397. The next prime is 121321423. The reversal of 121321420 is 24123121.

It is a junction number, because it is equal to n+sod(n) for n = 121321394 and 121321403.

It is not an unprimeable number, because it can be changed into a prime (121321423) 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 7 ways as a sum of consecutive naturals, for example, 275511 + ... + 275950.

It is an arithmetic number, because the mean of its divisors is an integer number (11580702).

Almost surely, 2^121321420 is an apocalyptic number.

121321420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321420 is an abundant number, since it is smaller than the sum of its proper divisors (156615428).

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

121321420 is a wasteful number, since it uses less digits than its factorization.

121321420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551481 (or 551479 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121321420 is about 11014.6003104970. The cubic root of 121321420 is about 495.0463106691.

Adding to 121321420 its reverse (24123121), we get a palindrome (145444541).

The spelling of 121321420 in words is "one hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty".