21022716 has 48 divisors (see below), whose sum is σ = 57633408. Its totient is φ = 5880000.

The previous prime is 21022711. The next prime is 21022723. The reversal of 21022716 is 61722012.

It is a junction number, because it is equal to n+sod(n) for n = 21022692 and 21022701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022711) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4410 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (1200696).

Almost surely, 2^21022716 is an apocalyptic number.

21022716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21022716 is an abundant number, since it is smaller than the sum of its proper divisors (36610692).

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

21022716 is a wasteful number, since it uses less digits than its factorization.

21022716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12282 (or 12280 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21022716 is about 4585.0535438531. The cubic root of 21022716 is about 275.9918607136.

Adding to 21022716 its reverse (61722012), we get a palindrome (82744728).

The spelling of 21022716 in words is "twenty-one million, twenty-two thousand, seven hundred sixteen".