21432602 has 4 divisors (see below), whose sum is σ = 32148906. Its totient is φ = 10716300.

The previous prime is 21432601. The next prime is 21432629. The reversal of 21432602 is 20623412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21353641 + 78961 = 4621^2 + 281^2 .

It is not an unprimeable number, because it can be changed into a prime (21432601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358149 + ... + 5358152.

Almost surely, 2^21432602 is an apocalyptic number.

21432602 is a deficient number, since it is larger than the sum of its proper divisors (10716304).

21432602 is a wasteful number, since it uses less digits than its factorization.

21432602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716303.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21432602 is about 4629.5358298646. The cubic root of 21432602 is about 277.7740257745.

The spelling of 21432602 in words is "twenty-one million, four hundred thirty-two thousand, six hundred two".