21142332 has 18 divisors (see below), whose sum is σ = 53443208. Its totient is φ = 7047432.

The previous prime is 21142291. The next prime is 21142343. The reversal of 21142332 is 23324112.

21142332 is a `hidden beast` number, since 211 + 423 + 32 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

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, 293608 + ... + 293679.

It is a self-describing number.

Almost surely, 2^21142332 is an apocalyptic number.

It is an amenable number.

21142332 is an abundant number, since it is smaller than the sum of its proper divisors (32300876).

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

21142332 is a wasteful number, since it uses less digits than its factorization.

21142332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587297 (or 587292 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21142332 is about 4598.0791641728. The cubic root of 21142332 is about 276.5143213787.

Adding to 21142332 its reverse (23324112), we get a palindrome (44466444).

The spelling of 21142332 in words is "twenty-one million, one hundred forty-two thousand, three hundred thirty-two".