21006230359 has 4 divisors (see below), whose sum is σ = 21730583160. Its totient is φ = 20281877560.

The previous prime is 21006230351. The next prime is 21006230407. The reversal of 21006230359 is 95303260012.

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

It is a cyclic number.

It is not a de Polignac number, because 21006230359 - 2³ = 21006230351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21006230359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006230351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362176357 + ... + 362176414.

It is an arithmetic number, because the mean of its divisors is an integer number (5432645790).

Almost surely, 2^21006230359 is an apocalyptic number.

21006230359 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21006230359 is a deficient number, since it is larger than the sum of its proper divisors (724352801).

21006230359 is an equidigital number, since it uses as much as digits as its factorization.

21006230359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724352800.

The product of its (nonzero) digits is 9720, while the sum is 31.

The spelling of 21006230359 in words is "twenty-one billion, six million, two hundred thirty thousand, three hundred fifty-nine".