21011776347 has 16 divisors (see below), whose sum is σ = 29217585152. Its totient is φ = 13416226560.

The previous prime is 21011776327. The next prime is 21011776349. The reversal of 21011776347 is 74367711012.

It is not a de Polignac number, because 21011776347 - 2¹¹ = 21011774299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011776349) 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 15 ways as a sum of consecutive naturals, for example, 1155583 + ... + 1173624.

It is an arithmetic number, because the mean of its divisors is an integer number (1826099072).

Almost surely, 2^21011776347 is an apocalyptic number.

21011776347 is a deficient number, since it is larger than the sum of its proper divisors (8205808805).

21011776347 is a wasteful number, since it uses less digits than its factorization.

21011776347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329338.

The product of its (nonzero) digits is 49392, while the sum is 39.

The spelling of 21011776347 in words is "twenty-one billion, eleven million, seven hundred seventy-six thousand, three hundred forty-seven".