27821751011 has 4 divisors (see below), whose sum is σ = 27833235792. Its totient is φ = 27810266232.

The previous prime is 27821750987. The next prime is 27821751109. The reversal of 27821751011 is 11015712872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27821751011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27821741011) 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, 5738756 + ... + 5743601.

It is an arithmetic number, because the mean of its divisors is an integer number (6958308948).

Almost surely, 2^27821751011 is an apocalyptic number.

27821751011 is a deficient number, since it is larger than the sum of its proper divisors (11484781).

27821751011 is a wasteful number, since it uses less digits than its factorization.

27821751011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11484780.

The product of its (nonzero) digits is 7840, while the sum is 35.

The spelling of 27821751011 in words is "twenty-seven billion, eight hundred twenty-one million, seven hundred fifty-one thousand, eleven".