21206532430 has 8 divisors (see below), whose sum is σ = 38171758392. Its totient is φ = 8482612968.

The previous prime is 21206532419. The next prime is 21206532443. The reversal of 21206532430 is 3423560212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060326612 + ... + 1060326631.

It is an arithmetic number, because the mean of its divisors is an integer number (4771469799).

Almost surely, 2^21206532430 is an apocalyptic number.

21206532430 is a deficient number, since it is larger than the sum of its proper divisors (16965225962).

21206532430 is a wasteful number, since it uses less digits than its factorization.

21206532430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120653250.

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 21206532430 in words is "twenty-one billion, two hundred six million, five hundred thirty-two thousand, four hundred thirty".