121641408 has 84 divisors (see below), whose sum is σ = 398485360. Its totient is φ = 34753536.

The previous prime is 121641407. The next prime is 121641431. The reversal of 121641408 is 804146121.

It is a happy number.

121641408 is a `hidden beast` number, since 1 + 216 + 41 + 408 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121641407) 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, 11053 + ... + 19116.

Almost surely, 2^121641408 is an apocalyptic number.

121641408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121641408 is an abundant number, since it is smaller than the sum of its proper divisors (276843952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121641408 is a wasteful number, since it uses less digits than its factorization.

121641408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30194 (or 30181 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 121641408 is about 11029.1163743974. The cubic root of 121641408 is about 495.4811605457.

Adding to 121641408 its reverse (804146121), we get a palindrome (925787529).

It can be divided in two parts, 1216 and 41408, that added together give a palindrome (42624).

The spelling of 121641408 in words is "one hundred twenty-one million, six hundred forty-one thousand, four hundred eight".