21730796 has 6 divisors (see below), whose sum is σ = 38028900. Its totient is φ = 10865396.

The previous prime is 21730769. The next prime is 21730799. The reversal of 21730796 is 69703712.

It is not an unprimeable number, because it can be changed into a prime (21730799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2716346 + ... + 2716353.

It is an arithmetic number, because the mean of its divisors is an integer number (6338150).

Almost surely, 2^21730796 is an apocalyptic number.

It is an amenable number.

21730796 is a deficient number, since it is larger than the sum of its proper divisors (16298104).

21730796 is a wasteful number, since it uses less digits than its factorization.

21730796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432703 (or 5432701 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21730796 is about 4661.6301869625. The cubic root of 21730796 is about 279.0563299716.

It can be divided in two parts, 217 and 30796, that added together give a palindrome (31013).

The spelling of 21730796 in words is "twenty-one million, seven hundred thirty thousand, seven hundred ninety-six".