21020221210210 has 32 divisors (see below), whose sum is σ = 37853613971712. Its totient is φ = 8404263607680.

The previous prime is 21020221210207. The next prime is 21020221210259. The reversal of 21020221210210 is 1201212202012.

It is a happy number.

It is a super-3 number, since 3×21020221210210³ (a number of 41 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 215926567 + ... + 216023893.

It is an arithmetic number, because the mean of its divisors is an integer number (1182925436616).

Almost surely, 2^{21020221210210} is an apocalyptic number.

21020221210210 is a deficient number, since it is larger than the sum of its proper divisors (16833392761502).

21020221210210 is a wasteful number, since it uses less digits than its factorization.

21020221210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106938.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020221210210 its reverse (1201212202012), we get a palindrome (22221433412222).

The spelling of 21020221210210 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred ten".