221020022121210 has 80 divisors (see below), whose sum is σ = 640013534172936. Its totient is φ = 54404928519552.

The previous prime is 221020022121193. The next prime is 221020022121299. The reversal of 221020022121210 is 12121220020122.

It is a happy number.

221020022121210 is a `hidden beast` number, since 2 + 2 + 10 + 200 + 221 + 21 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 163814836166289 + 57205185954921 = 12799017^2 + 7563411^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10494767349 + ... + 10494788408.

Almost surely, 2^{221020022121210} is an apocalyptic number.

221020022121210 is an abundant number, since it is smaller than the sum of its proper divisors (418993512051726).

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

221020022121210 is a wasteful number, since it uses less digits than its factorization.

221020022121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20989555789 (or 20989555780 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221020022121210 its reverse (12121220020122), we get a palindrome (233141242141332).

The spelling of 221020022121210 in words is "two hundred twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-one thousand, two hundred ten".