21421132 has 12 divisors (see below), whose sum is σ = 39460120. Its totient is φ = 10146816.

The previous prime is 21421123. The next prime is 21421133. The reversal of 21421132 is 23112412.

It is a super-2 number, since 2×21421132² = 917729792322848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21421133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140853 + ... + 141004.

Almost surely, 2^21421132 is an apocalyptic number.

It is an amenable number.

21421132 is a deficient number, since it is larger than the sum of its proper divisors (18038988).

21421132 is a wasteful number, since it uses less digits than its factorization.

21421132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281880 (or 281878 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21421132 is about 4628.2968789826. The cubic root of 21421132 is about 277.7244651938.

Adding to 21421132 its reverse (23112412), we get a palindrome (44533544).

The spelling of 21421132 in words is "twenty-one million, four hundred twenty-one thousand, one hundred thirty-two".