21703641740 has 72 divisors (see below), whose sum is σ = 50131221840. Its totient is φ = 7886961280.

The previous prime is 21703641737. The next prime is 21703641761. The reversal of 21703641740 is 4714630712.

It is a self number, because there is not a number n which added to its sum of digits gives 21703641740.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7038239 + ... + 7041321.

It is an arithmetic number, because the mean of its divisors is an integer number (696266970).

Almost surely, 2^21703641740 is an apocalyptic number.

21703641740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21703641740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25065610920).

21703641740 is an abundant number, since it is smaller than the sum of its proper divisors (28427580100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21703641740 is a wasteful number, since it uses less digits than its factorization.

21703641740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023 (or 6010 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 21703641740 in words is "twenty-one billion, seven hundred three million, six hundred forty-one thousand, seven hundred forty".