21022101221210 has 8 divisors (see below), whose sum is σ = 37839782198196. Its totient is φ = 8408840488480.

The previous prime is 21022101221179. The next prime is 21022101221237. The reversal of 21022101221210 is 1212210122012.

It can be written as a sum of positive squares in 2 ways, for example, as 19357069710889 + 1665031510321 = 4399667^2 + 1290361^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051105061051 + ... + 1051105061070.

Almost surely, 2^{21022101221210} is an apocalyptic number.

21022101221210 is a deficient number, since it is larger than the sum of its proper divisors (16817680976986).

21022101221210 is a wasteful number, since it uses less digits than its factorization.

21022101221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102210122128.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21022101221210 its reverse (1212210122012), we get a palindrome (22234311343222).

The spelling of 21022101221210 in words is "twenty-one trillion, twenty-two billion, one hundred one million, two hundred twenty-one thousand, two hundred ten".