21436132 has 12 divisors (see below), whose sum is σ = 38128636. Its totient is φ = 10542240.

The previous prime is 21436117. The next prime is 21436147. The reversal of 21436132 is 23163412.

It is an interprime number because it is at equal distance from previous prime (21436117) and next prime (21436147).

It can be written as a sum of positive squares in 2 ways, for example, as 1132096 + 20304036 = 1064^2 + 4506^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43683 + ... + 44170.

Almost surely, 2^21436132 is an apocalyptic number.

It is an amenable number.

21436132 is a deficient number, since it is larger than the sum of its proper divisors (16692504).

21436132 is a wasteful number, since it uses less digits than its factorization.

21436132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87918 (or 87916 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21436132 is about 4629.9170618921. The cubic root of 21436132 is about 277.7892749493.

Adding to 21436132 its reverse (23163412), we get a palindrome (44599544).

The spelling of 21436132 in words is "twenty-one million, four hundred thirty-six thousand, one hundred thirty-two".