21010222210 has 32 divisors (see below), whose sum is σ = 38190962160. Its totient is φ = 8321445888.

The previous prime is 21010222187. The next prime is 21010222237. The reversal of 21010222210 is 1222201012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1028420761 + 19981801449 = 32069^2 + 141357^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199274 + ... + 1216666.

Almost surely, 2^21010222210 is an apocalyptic number.

21010222210 is a deficient number, since it is larger than the sum of its proper divisors (17180739950).

21010222210 is a wasteful number, since it uses less digits than its factorization.

21010222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18582.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21010222210 its reverse (1222201012), we get a palindrome (22232423222).

The spelling of 21010222210 in words is "twenty-one billion, ten million, two hundred twenty-two thousand, two hundred ten".