21430132 has 24 divisors (see below), whose sum is σ = 40166280.
Its totient is φ = 9968640.
The previous prime is 21430121. The next prime is 21430139. The reversal of 21430132 is 23103412.
Adding to 21430132 its reverse (23103412), we get a palindrome (44533544).
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 2298256 + 19131876 = 1516^2 + 4374^2
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21430139) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4282 + ... + 7822.
It is an arithmetic number, because the mean of its divisors is an integer number (1673595).
Almost surely, 221430132 is an apocalyptic number.
It is an amenable number.
21430132 is a deficient number, since it is larger than the sum of its proper divisors (18736148).
21430132 is a wasteful number, since it uses less digits than its factorization.
21430132 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3651 (or 3649 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 16.
The square root of 21430132 is about 4629.2690567734.
The cubic root of 21430132 is about 277.7633546763.
The spelling of 21430132 in words is "twenty-one million, four hundred thirty thousand, one hundred thirty-two".