21022010 has 8 divisors (see below), whose sum is σ = 37839636. Its totient is φ = 8408800.

The previous prime is 21022009. The next prime is 21022021. The reversal of 21022010 is 1022012.

It can be written as a sum of positive squares in 2 ways, for example, as 20638849 + 383161 = 4543^2 + 619^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051091 + ... + 1051110.

Almost surely, 2^21022010 is an apocalyptic number.

21022010 is a deficient number, since it is larger than the sum of its proper divisors (16817626).

21022010 is a wasteful number, since it uses less digits than its factorization.

21022010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102208.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21022010 is about 4584.9765539204. The cubic root of 21022010 is about 275.9887711598.

Adding to 21022010 its reverse (1022012), we get a palindrome (22044022).

The spelling of 21022010 in words is "twenty-one million, twenty-two thousand, ten".