21688241630 has 32 divisors (see below), whose sum is σ = 42595061760. Its totient is φ = 7885292320.

The previous prime is 21688241591. The next prime is 21688241651. The reversal of 21688241630 is 3614288612.

21688241630 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 823811 + ... + 849729.

It is an arithmetic number, because the mean of its divisors is an integer number (1331095680).

Almost surely, 2^21688241630 is an apocalyptic number.

21688241630 is a deficient number, since it is larger than the sum of its proper divisors (20906820130).

21688241630 is a wasteful number, since it uses less digits than its factorization.

21688241630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33544.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 21688241630 in words is "twenty-one billion, six hundred eighty-eight million, two hundred forty-one thousand, six hundred thirty".