21150716 has 6 divisors (see below), whose sum is σ = 37013760. Its totient is φ = 10575356.

The previous prime is 21150709. The next prime is 21150719. The reversal of 21150716 is 61705112.

It is a junction number, because it is equal to n+sod(n) for n = 21150691 and 21150700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643836 + ... + 2643843.

It is an arithmetic number, because the mean of its divisors is an integer number (6168960).

Almost surely, 2^21150716 is an apocalyptic number.

It is an amenable number.

21150716 is a deficient number, since it is larger than the sum of its proper divisors (15863044).

21150716 is a wasteful number, since it uses less digits than its factorization.

21150716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287683 (or 5287681 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 21150716 is about 4598.9907588513. The cubic root of 21150716 is about 276.5508671690.

Adding to 21150716 its reverse (61705112), we get a palindrome (82855828).

The spelling of 21150716 in words is "twenty-one million, one hundred fifty thousand, seven hundred sixteen".