21115796 has 12 divisors (see below), whose sum is σ = 39795252. Its totient is φ = 9745728.

The previous prime is 21115793. The next prime is 21115837. The reversal of 21115796 is 69751112.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 14714896 = 2530^2 + 3836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202985 + ... + 203088.

It is an arithmetic number, because the mean of its divisors is an integer number (3316271).

Almost surely, 2^21115796 is an apocalyptic number.

21115796 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21115796 is a deficient number, since it is larger than the sum of its proper divisors (18679456).

21115796 is a wasteful number, since it uses less digits than its factorization.

21115796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406090 (or 406088 counting only the distinct ones).

The product of its digits is 3780, while the sum is 32.

The square root of 21115796 is about 4595.1927054260. The cubic root of 21115796 is about 276.3985874409.

The spelling of 21115796 in words is "twenty-one million, one hundred fifteen thousand, seven hundred ninety-six".