21143716 has 48 divisors (see below), whose sum is σ = 44634240. Its totient is φ = 8645120.

The previous prime is 21143671. The next prime is 21143719. The reversal of 21143716 is 61734112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16590 + ... + 17818.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 2^21143716 is an apocalyptic number.

It is an amenable number.

21143716 is an abundant number, since it is smaller than the sum of its proper divisors (23490524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143716 is a wasteful number, since it uses less digits than its factorization.

21143716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1282 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21143716 is about 4598.2296593363. The cubic root of 21143716 is about 276.5203548895.

Adding to 21143716 its reverse (61734112), we get a palindrome (82877828).

The spelling of 21143716 in words is "twenty-one million, one hundred forty-three thousand, seven hundred sixteen".