21371116 has 12 divisors (see below), whose sum is σ = 40276432. Its totient is φ = 9863568.

The previous prime is 21371113. The next prime is 21371153. The reversal of 21371116 is 61117312.

It is not an unprimeable number, because it can be changed into a prime (21371113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205440 + ... + 205543.

Almost surely, 2^21371116 is an apocalyptic number.

21371116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21371116 is a deficient number, since it is larger than the sum of its proper divisors (18905316).

21371116 is a wasteful number, since it uses less digits than its factorization.

21371116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411000 (or 410998 counting only the distinct ones).

The product of its digits is 252, while the sum is 22.

The square root of 21371116 is about 4622.8904378105. The cubic root of 21371116 is about 277.5081446626.

Adding to 21371116 its reverse (61117312), we get a palindrome (82488428).

The spelling of 21371116 in words is "twenty-one million, three hundred seventy-one thousand, one hundred sixteen".