21060722 has 16 divisors (see below), whose sum is σ = 33786072. Its totient is φ = 9811200.

The previous prime is 21060707. The next prime is 21060731. The reversal of 21060722 is 22706012.

It can be written as a sum of positive squares in 4 ways, for example, as 18567481 + 2493241 = 4309^2 + 1579^2 .

It is a super-2 number, since 2×21060722² = 887108022322568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21060694 and 21060703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368 + ... + 6500.

Almost surely, 2^21060722 is an apocalyptic number.

21060722 is a deficient number, since it is larger than the sum of its proper divisors (12725350).

21060722 is a wasteful number, since it uses less digits than its factorization.

21060722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21060722 is about 4589.1962259202. The cubic root of 21060722 is about 276.1580782459.

Adding to 21060722 its reverse (22706012), we get a palindrome (43766734).

The spelling of 21060722 in words is "twenty-one million, sixty thousand, seven hundred twenty-two".