21113727847 has 8 divisors (see below), whose sum is σ = 22572759456. Its totient is φ = 19678812672.

The previous prime is 21113727823. The next prime is 21113727857. The reversal of 21113727847 is 74872731112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21113727847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113727857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6027298 + ... + 6030799.

It is an arithmetic number, because the mean of its divisors is an integer number (2821594932).

Almost surely, 2^21113727847 is an apocalyptic number.

21113727847 is a deficient number, since it is larger than the sum of its proper divisors (1459031609).

21113727847 is a wasteful number, since it uses less digits than its factorization.

21113727847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12058217.

The product of its digits is 131712, while the sum is 43.

The spelling of 21113727847 in words is "twenty-one billion, one hundred thirteen million, seven hundred twenty-seven thousand, eight hundred forty-seven".