21011608712 has 8 divisors (see below), whose sum is σ = 39396766350. Its totient is φ = 10505804352.

The previous prime is 21011608663. The next prime is 21011608733. The reversal of 21011608712 is 21780611012.

It can be written as a sum of positive squares in only one way, i.e., 19995656836 + 1015951876 = 141406^2 + 31874^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313225537 + ... + 1313225552.

Almost surely, 2^21011608712 is an apocalyptic number.

It is an amenable number.

21011608712 is a deficient number, since it is larger than the sum of its proper divisors (18385157638).

21011608712 is a wasteful number, since it uses less digits than its factorization.

21011608712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626451095 (or 2626451091 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The spelling of 21011608712 in words is "twenty-one billion, eleven million, six hundred eight thousand, seven hundred twelve".