21011310128 has 20 divisors (see below), whose sum is σ = 40764974208. Its totient is φ = 10491316800.

The previous prime is 21011310121. The next prime is 21011310137. The reversal of 21011310128 is 82101311012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21011310121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884048 + ... + 907503.

Almost surely, 2^21011310128 is an apocalyptic number.

It is an amenable number.

21011310128 is a deficient number, since it is larger than the sum of its proper divisors (19753664080).

21011310128 is a wasteful number, since it uses less digits than its factorization.

21011310128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792292 (or 1792286 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 21011310128 in words is "twenty-one billion, eleven million, three hundred ten thousand, one hundred twenty-eight".