21711718544 has 10 divisors (see below), whose sum is σ = 42066454710. Its totient is φ = 10855859264.

The previous prime is 21711718537. The next prime is 21711718603. The reversal of 21711718544 is 44581711712.

It can be written as a sum of positive squares in only one way, i.e., 14789478544 + 6922240000 = 121612^2 + 83200^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678491189 + ... + 678491220.

It is an arithmetic number, because the mean of its divisors is an integer number (4206645471).

Almost surely, 2^21711718544 is an apocalyptic number.

It is an amenable number.

21711718544 is a deficient number, since it is larger than the sum of its proper divisors (20354736166).

21711718544 is a wasteful number, since it uses less digits than its factorization.

21711718544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356982417 (or 1356982411 counting only the distinct ones).

The product of its digits is 62720, while the sum is 41.

The spelling of 21711718544 in words is "twenty-one billion, seven hundred eleven million, seven hundred eighteen thousand, five hundred forty-four".