21029341688 has 8 divisors (see below), whose sum is σ = 39430015680. Its totient is φ = 10514670840.

The previous prime is 21029341679. The next prime is 21029341699. The reversal of 21029341688 is 88614392012.

It is a happy number.

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

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, 1314333848 + ... + 1314333863.

It is an arithmetic number, because the mean of its divisors is an integer number (4928751960).

Almost surely, 2^21029341688 is an apocalyptic number.

It is an amenable number.

21029341688 is a deficient number, since it is larger than the sum of its proper divisors (18400673992).

21029341688 is a wasteful number, since it uses less digits than its factorization.

21029341688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628667717 (or 2628667713 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 21029341688 in words is "twenty-one billion, twenty-nine million, three hundred forty-one thousand, six hundred eighty-eight".