21430642606 has 8 divisors (see below), whose sum is σ = 32152076064. Its totient is φ = 10713283920.

The previous prime is 21430642601. The next prime is 21430642613. The reversal of 21430642606 is 60624603412.

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

It is a super-3 number, since 3×21430642606³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430642601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005510 + ... + 1026601.

It is an arithmetic number, because the mean of its divisors is an integer number (4019009508).

Almost surely, 2^21430642606 is an apocalyptic number.

21430642606 is a deficient number, since it is larger than the sum of its proper divisors (10721433458).

21430642606 is a wasteful number, since it uses less digits than its factorization.

21430642606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037386.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 21430642606 in words is "twenty-one billion, four hundred thirty million, six hundred forty-two thousand, six hundred six".