21805150713 has 8 divisors (see below), whose sum is σ = 30337601088. Its totient is φ = 13904733744.

The previous prime is 21805150693. The next prime is 21805150739. The reversal of 21805150713 is 31705150812.

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

It is not a de Polignac number, because 21805150713 - 2¹² = 21805146617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21805150613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158008270 + ... + 158008407.

It is an arithmetic number, because the mean of its divisors is an integer number (3792200136).

Almost surely, 2^21805150713 is an apocalyptic number.

21805150713 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21805150713 is a deficient number, since it is larger than the sum of its proper divisors (8532450375).

21805150713 is a wasteful number, since it uses less digits than its factorization.

21805150713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316016703.

The product of its (nonzero) digits is 8400, while the sum is 33.

Subtracting 21805150713 from its reverse (31705150812), we obtain a palindrome (9900000099).

The spelling of 21805150713 in words is "twenty-one billion, eight hundred five million, one hundred fifty thousand, seven hundred thirteen".