21111520336 has 10 divisors (see below), whose sum is σ = 40903570682. Its totient is φ = 10555760160.

The previous prime is 21111520307. The next prime is 21111520349. The reversal of 21111520336 is 63302511112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20867535936 + 243984400 = 144456^2 + 15620^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21111520336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659734995 + ... + 659735026.

Almost surely, 2^21111520336 is an apocalyptic number.

It is an amenable number.

21111520336 is a deficient number, since it is larger than the sum of its proper divisors (19792050346).

21111520336 is a wasteful number, since it uses less digits than its factorization.

21111520336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319470029 (or 1319470023 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 21111520336 in words is "twenty-one billion, one hundred eleven million, five hundred twenty thousand, three hundred thirty-six".