21353132 has 6 divisors (see below), whose sum is σ = 37367988. Its totient is φ = 10676564.

The previous prime is 21353119. The next prime is 21353153. The reversal of 21353132 is 23135312.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669138 + ... + 2669145.

It is an arithmetic number, because the mean of its divisors is an integer number (6227998).

Almost surely, 2^21353132 is an apocalyptic number.

It is an amenable number.

21353132 is a deficient number, since it is larger than the sum of its proper divisors (16014856).

21353132 is a wasteful number, since it uses less digits than its factorization.

21353132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338287 (or 5338285 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21353132 is about 4620.9449250126. The cubic root of 21353132 is about 277.4302808918.

Adding to 21353132 its reverse (23135312), we get a palindrome (44488444).

The spelling of 21353132 in words is "twenty-one million, three hundred fifty-three thousand, one hundred thirty-two".