21741315684 has 96 divisors (see below), whose sum is σ = 58095636480. Its totient is φ = 6267619200.

The previous prime is 21741315559. The next prime is 21741315697. The reversal of 21741315684 is 48651314712.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196402 + ... + 286454.

It is an arithmetic number, because the mean of its divisors is an integer number (605162880).

Almost surely, 2^21741315684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21741315684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29047818240).

21741315684 is an abundant number, since it is smaller than the sum of its proper divisors (36354320796).

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

21741315684 is a wasteful number, since it uses less digits than its factorization.

21741315684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90161 (or 90159 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The spelling of 21741315684 in words is "twenty-one billion, seven hundred forty-one million, three hundred fifteen thousand, six hundred eighty-four".