21047782101 has 16 divisors (see below), whose sum is σ = 28182273600. Its totient is φ = 13972693248.

The previous prime is 21047782087. The next prime is 21047782111. The reversal of 21047782101 is 10128774012.

It is not a de Polignac number, because 21047782101 - 2⁵ = 21047782069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21047782111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707805 + ... + 736941.

It is an arithmetic number, because the mean of its divisors is an integer number (1761392100).

Almost surely, 2^21047782101 is an apocalyptic number.

It is an amenable number.

21047782101 is a deficient number, since it is larger than the sum of its proper divisors (7134491499).

21047782101 is a wasteful number, since it uses less digits than its factorization.

21047782101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30148.

The product of its (nonzero) digits is 6272, while the sum is 33.

The spelling of 21047782101 in words is "twenty-one billion, forty-seven million, seven hundred eighty-two thousand, one hundred one".