121646421 has 32 divisors (see below), whose sum is σ = 195861120. Its totient is φ = 74172672.

The previous prime is 121646401. The next prime is 121646429. The reversal of 121646421 is 124646121.

121646421 is a `hidden beast` number, since 1 + 2 + 16 + 4 + 642 + 1 = 666.

It is not a de Polignac number, because 121646421 - 2⁵ = 121646389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121646429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38130 + ... + 41196.

It is an arithmetic number, because the mean of its divisors is an integer number (6120660).

Almost surely, 2^121646421 is an apocalyptic number.

It is an amenable number.

121646421 is a deficient number, since it is larger than the sum of its proper divisors (74214699).

121646421 is a wasteful number, since it uses less digits than its factorization.

121646421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202 (or 3196 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 121646421 is about 11029.3436341425. The cubic root of 121646421 is about 495.4879669257.

The spelling of 121646421 in words is "one hundred twenty-one million, six hundred forty-six thousand, four hundred twenty-one".