121244420 has 36 divisors (see below), whose sum is σ = 279869772. Its totient is φ = 44088000.

The previous prime is 121244419. The next prime is 121244423. The reversal of 121244420 is 24442121.

It can be written as a sum of positive squares in 2 ways, for example, as 28815424 + 92428996 = 5368^2 + 9614^2 .

It is a super-2 number, since 2×121244420² = 29400418762272800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121244392 and 121244401.

It is not an unprimeable number, because it can be changed into a prime (121244423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22631 + ... + 27470.

Almost surely, 2^121244420 is an apocalyptic number.

121244420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121244420 is an abundant number, since it is smaller than the sum of its proper divisors (158625352).

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

121244420 is a wasteful number, since it uses less digits than its factorization.

121244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50132 (or 50119 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 121244420 is about 11011.1043951095. The cubic root of 121244420 is about 494.9415568861.

Adding to 121244420 its reverse (24442121), we get a palindrome (145686541).

The spelling of 121244420 in words is "one hundred twenty-one million, two hundred forty-four thousand, four hundred twenty".