121636025 has 24 divisors (see below), whose sum is σ = 173929344. Its totient is φ = 82656000.

The previous prime is 121635991. The next prime is 121636027. The reversal of 121636025 is 520636121.

It is not a de Polignac number, because 121636025 - 2⁶ = 121635961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121635985 and 121636003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121636027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16700 + ... + 22850.

It is an arithmetic number, because the mean of its divisors is an integer number (7247056).

Almost surely, 2^121636025 is an apocalyptic number.

It is an amenable number.

121636025 is a deficient number, since it is larger than the sum of its proper divisors (52293319).

121636025 is a wasteful number, since it uses less digits than its factorization.

121636025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6281 (or 6276 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 121636025 is about 11028.8723358284. The cubic root of 121636025 is about 495.4738515915.

The spelling of 121636025 in words is "one hundred twenty-one million, six hundred thirty-six thousand, twenty-five".