21298890688 has 28 divisors (see below), whose sum is σ = 42288917200. Its totient is φ = 10643415552.

The previous prime is 21298890661. The next prime is 21298890707. The reversal of 21298890688 is 88609889212.

It is a super-2 number, since 2×21298890688² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20788 + ... + 207436.

Almost surely, 2^21298890688 is an apocalyptic number.

It is an amenable number.

21298890688 is a deficient number, since it is larger than the sum of its proper divisors (20990026512).

21298890688 is a wasteful number, since it uses less digits than its factorization.

21298890688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188444 (or 188434 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 61.

The spelling of 21298890688 in words is "twenty-one billion, two hundred ninety-eight million, eight hundred ninety thousand, six hundred eighty-eight".