121405025 has 12 divisors (see below), whose sum is σ = 172048512. Its totient is φ = 83249040.

The previous prime is 121404979. The next prime is 121405027. The reversal of 121405025 is 520504121.

It is not a de Polignac number, because 121405025 - 2⁶ = 121404961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121404988 and 121405006.

It is not an unprimeable number, because it can be changed into a prime (121405027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346697 + ... + 347046.

It is an arithmetic number, because the mean of its divisors is an integer number (14337376).

Almost surely, 2^121405025 is an apocalyptic number.

It is an amenable number.

121405025 is a deficient number, since it is larger than the sum of its proper divisors (50643487).

121405025 is an equidigital number, since it uses as much as digits as its factorization.

121405025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693760 (or 693755 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 121405025 is about 11018.3948468005. The cubic root of 121405025 is about 495.1599999727.

Adding to 121405025 its reverse (520504121), we get a palindrome (641909146).

The spelling of 121405025 in words is "one hundred twenty-one million, four hundred five thousand, twenty-five".