21741696 has 112 divisors (see below), whose sum is σ = 65219310. Its totient is φ = 7216128.

The previous prime is 21741689. The next prime is 21741743. The reversal of 21741696 is 69614712.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 1166400 = 4536^2 + 1080^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21741696.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 93196 + ... + 93428.

Almost surely, 2^21741696 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 21741696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32609655).

21741696 is an abundant number, since it is smaller than the sum of its proper divisors (43477614).

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

21741696 is an frugal number, since it uses more digits than its factorization.

21741696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 238 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21741696 is about 4662.7991593033. The cubic root of 21741696 is about 279.1029796751.

The spelling of 21741696 in words is "twenty-one million, seven hundred forty-one thousand, six hundred ninety-six".