21147116 has 12 divisors (see below), whose sum is σ = 39184488. Its totient is φ = 9951552.

The previous prime is 21147107. The next prime is 21147127. The reversal of 21147116 is 61174112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21147091 and 21147100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155426 + ... + 155561.

It is an arithmetic number, because the mean of its divisors is an integer number (3265374).

Almost surely, 2^21147116 is an apocalyptic number.

It is an amenable number.

21147116 is a deficient number, since it is larger than the sum of its proper divisors (18037372).

21147116 is a wasteful number, since it uses less digits than its factorization.

21147116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311008 (or 311006 counting only the distinct ones).

The product of its digits is 336, while the sum is 23.

The square root of 21147116 is about 4598.5993519766. The cubic root of 21147116 is about 276.5351759805.

The spelling of 21147116 in words is "twenty-one million, one hundred forty-seven thousand, one hundred sixteen".