21020682 has 16 divisors (see below), whose sum is σ = 42130080. Its totient is φ = 6992112.

The previous prime is 21020651. The next prime is 21020683. The reversal of 21020682 is 28602012.

It is not an unprimeable number, because it can be changed into a prime (21020683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (2633130).

Almost surely, 2^21020682 is an apocalyptic number.

21020682 is an abundant number, since it is smaller than the sum of its proper divisors (21109398).

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

21020682 is a wasteful number, since it uses less digits than its factorization.

21020682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7397.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21020682 is about 4584.8317308272. The cubic root of 21020682 is about 275.9829594604.

Adding to 21020682 its reverse (28602012), we get a palindrome (49622694).

The spelling of 21020682 in words is "twenty-one million, twenty thousand, six hundred eighty-two".