121221425 has 48 divisors (see below), whose sum is σ = 173530560. Its totient is φ = 83255040.

The previous prime is 121221403. The next prime is 121221449. The reversal of 121221425 is 524122121.

It is not a de Polignac number, because 121221425 - 2¹⁰ = 121220401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221397 and 121221406.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413579 + ... + 413871.

It is an arithmetic number, because the mean of its divisors is an integer number (3615220).

Almost surely, 2^121221425 is an apocalyptic number.

It is an amenable number.

121221425 is a deficient number, since it is larger than the sum of its proper divisors (52309135).

121221425 is a wasteful number, since it uses less digits than its factorization.

121221425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 397 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 121221425 is about 11010.0601724060. The cubic root of 121221425 is about 494.9102649974.

Adding to 121221425 its reverse (524122121), we get a palindrome (645343546).

The spelling of 121221425 in words is "one hundred twenty-one million, two hundred twenty-one thousand, four hundred twenty-five".