21010722 has 8 divisors (see below), whose sum is σ = 42021456. Its totient is φ = 7003572.

The previous prime is 21010721. The next prime is 21010723. The reversal of 21010722 is 22701012.

It is an interprime number because it is at equal distance from previous prime (21010721) and next prime (21010723).

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

21010722 is an admirable number.

It is a super-2 number, since 2×21010722² = 882900877922568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010721) 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, 1750888 + ... + 1750899.

It is an arithmetic number, because the mean of its divisors is an integer number (5252682).

Almost surely, 2^21010722 is an apocalyptic number.

21010722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21010722 is a wasteful number, since it uses less digits than its factorization.

21010722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501792.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21010722 is about 4583.7454117785. The cubic root of 21010722 is about 275.9393639111.

Adding to 21010722 its reverse (22701012), we get a palindrome (43711734).

The spelling of 21010722 in words is "twenty-one million, ten thousand, seven hundred twenty-two".