21796 has 6 divisors (see below), whose sum is σ = 38150. Its totient is φ = 10896.
The previous prime is 21787. The next prime is 21799. The reversal of 21796 is 69712.
It can be written as a sum of positive squares in only one way, i.e., 14400 + 7396 = 120^2 + 86^2 .
It is a self number, because there is not a number n which added to its sum of digits gives 21796.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21799) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2721 + ... + 2728.
221796 is an apocalyptic number.
It is an amenable number.
21796 is a deficient number, since it is larger than the sum of its proper divisors (16354).
21796 is a wasteful number, since it uses less digits than its factorization.
21796 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5453 (or 5451 counting only the distinct ones).
The product of its digits is 756, while the sum is 25.
The square root of 21796 is about 147.6346842717. The cubic root of 21796 is about 27.9335157315.
It can be divided in two parts, 217 and 96, that added together give a palindrome (313).
The spelling of 21796 in words is "twenty-one thousand, seven hundred ninety-six".
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