121432644 has 18 divisors (see below), whose sum is σ = 306954830. Its totient is φ = 40477536.

The previous prime is 121432613. The next prime is 121432687. The reversal of 121432644 is 446234121.

It is a happy number.

121432644 is a `hidden beast` number, since 1 + 2 + 14 + 3 + 2 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 58706244 = 7920^2 + 7662^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1686529 + ... + 1686600.

Almost surely, 2^121432644 is an apocalyptic number.

It is an amenable number.

121432644 is an abundant number, since it is smaller than the sum of its proper divisors (185522186).

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

121432644 is a wasteful number, since it uses less digits than its factorization.

121432644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373139 (or 3373134 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 121432644 is about 11019.6480887549. The cubic root of 121432644 is about 495.1975458846.

Adding to 121432644 its reverse (446234121), we get a palindrome (567666765).

The spelling of 121432644 in words is "one hundred twenty-one million, four hundred thirty-two thousand, six hundred forty-four".