21430602 has 32 divisors (see below), whose sum is σ = 48081600. Its totient is φ = 7074864.

The previous prime is 21430597. The next prime is 21430621. The reversal of 21430602 is 20603412.

It is a happy number.

21430602 is a `hidden beast` number, since 21 + 43 + 0 + 602 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3924 + ... + 7632.

It is an arithmetic number, because the mean of its divisors is an integer number (1502550).

Almost surely, 2^21430602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21430602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24040800).

21430602 is an abundant number, since it is smaller than the sum of its proper divisors (26650998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21430602 is a wasteful number, since it uses less digits than its factorization.

21430602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827 (or 3821 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21430602 is about 4629.3198204488. The cubic root of 21430602 is about 277.7653852723.

The spelling of 21430602 in words is "twenty-one million, four hundred thirty thousand, six hundred two".