21062722 has 4 divisors (see below), whose sum is σ = 31594086. Its totient is φ = 10531360.

The previous prime is 21062719. The next prime is 21062737. The reversal of 21062722 is 22726012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 95481 = 4579^2 + 309^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21062693 and 21062702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5265679 + ... + 5265682.

Almost surely, 2^21062722 is an apocalyptic number.

21062722 is a deficient number, since it is larger than the sum of its proper divisors (10531364).

21062722 is a wasteful number, since it uses less digits than its factorization.

21062722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10531363.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21062722 is about 4589.4141238289. The cubic root of 21062722 is about 276.1668196156.

Adding to 21062722 its reverse (22726012), we get a palindrome (43788734).

The spelling of 21062722 in words is "twenty-one million, sixty-two thousand, seven hundred twenty-two".