21030722 has 8 divisors (see below), whose sum is σ = 31572156. Its totient is φ = 10506672.

The previous prime is 21030721. The next prime is 21030767. The reversal of 21030722 is 22703012.

It can be written as a sum of positive squares in 2 ways, for example, as 17901361 + 3129361 = 4231^2 + 1769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21030722.

It is not an unprimeable number, because it can be changed into a prime (21030721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713 + ... + 6524.

Almost surely, 2^21030722 is an apocalyptic number.

21030722 is a deficient number, since it is larger than the sum of its proper divisors (10541434).

21030722 is a wasteful number, since it uses less digits than its factorization.

21030722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8692.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21030722 is about 4585.9265148931. The cubic root of 21030722 is about 276.0268912397.

Adding to 21030722 its reverse (22703012), we get a palindrome (43733734).

The spelling of 21030722 in words is "twenty-one million, thirty thousand, seven hundred twenty-two".