21532136 has 8 divisors (see below), whose sum is σ = 40372770. Its totient is φ = 10766064.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532136 is 63123512.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 3976036 = 4190^2 + 1994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345751 + ... + 1345766.

Almost surely, 2^21532136 is an apocalyptic number.

It is an amenable number.

21532136 is a deficient number, since it is larger than the sum of its proper divisors (18840634).

21532136 is a wasteful number, since it uses less digits than its factorization.

21532136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691523 (or 2691519 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 21532136 is about 4640.2732678152. The cubic root of 21532136 is about 278.2033603383.

Adding to 21532136 its reverse (63123512), we get a palindrome (84655648).

The spelling of 21532136 in words is "twenty-one million, five hundred thirty-two thousand, one hundred thirty-six".