121003421 has 16 divisors (see below), whose sum is σ = 152565120. Its totient is φ = 93223680.

The previous prime is 121003417. The next prime is 121003439. The reversal of 121003421 is 124300121.

It is not a de Polignac number, because 121003421 - 2² = 121003417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121003396 and 121003405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121003471) 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 15 ways as a sum of consecutive naturals, for example, 1976 + ... + 15681.

It is an arithmetic number, because the mean of its divisors is an integer number (9535320).

Almost surely, 2^121003421 is an apocalyptic number.

121003421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121003421 is a deficient number, since it is larger than the sum of its proper divisors (31561699).

121003421 is a wasteful number, since it uses less digits than its factorization.

121003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17764.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121003421 is about 11000.1554989009. The cubic root of 121003421 is about 494.6134055937.

Adding to 121003421 its reverse (124300121), we get a palindrome (245303542).

The spelling of 121003421 in words is "one hundred twenty-one million, three thousand, four hundred twenty-one".