121210420 has 12 divisors (see below), whose sum is σ = 254541924. Its totient is φ = 48484160.

The previous prime is 121210399. The next prime is 121210429. The reversal of 121210420 is 24012121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27081616 + 94128804 = 5204^2 + 9702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121210420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030241 + ... + 3030280.

It is an arithmetic number, because the mean of its divisors is an integer number (21211827).

Almost surely, 2^121210420 is an apocalyptic number.

121210420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210420 is an abundant number, since it is smaller than the sum of its proper divisors (133331504).

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

121210420 is a wasteful number, since it uses less digits than its factorization.

121210420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060530 (or 6060528 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 121210420 is about 11009.5603908603. The cubic root of 121210420 is about 494.8952878532.

Adding to 121210420 its reverse (24012121), we get a palindrome (145222541).

The spelling of 121210420 in words is "one hundred twenty-one million, two hundred ten thousand, four hundred twenty".