21432141 has 16 divisors (see below), whose sum is σ = 32428800. Its totient is φ = 13983264.

The previous prime is 21432107. The next prime is 21432157. The reversal of 21432141 is 14123412.

It is not a de Polignac number, because 21432141 - 2⁶ = 21432077 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7176 + ... + 9713.

It is an arithmetic number, because the mean of its divisors is an integer number (2026800).

Almost surely, 2^21432141 is an apocalyptic number.

It is an amenable number.

21432141 is a deficient number, since it is larger than the sum of its proper divisors (10996659).

21432141 is a wasteful number, since it uses less digits than its factorization.

21432141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16945 (or 16939 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21432141 is about 4629.4860405881. The cubic root of 21432141 is about 277.7720341864.

Adding to 21432141 its reverse (14123412), we get a palindrome (35555553).

The spelling of 21432141 in words is "twenty-one million, four hundred thirty-two thousand, one hundred forty-one".