21220220202210 has 48 divisors (see below), whose sum is σ = 56107700887680. Its totient is φ = 5562814786080.

The previous prime is 21220220202163. The next prime is 21220220202211. The reversal of 21220220202210 is 1220202202212.

21220220202210 is a `hidden beast` number, since 2 + 1 + 220 + 220 + 2 + 0 + 221 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21220220202211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1998132186 + ... + 1998142805.

It is an arithmetic number, because the mean of its divisors is an integer number (1168910435160).

Almost surely, 2^{21220220202210} is an apocalyptic number.

21220220202210 is an abundant number, since it is smaller than the sum of its proper divisors (34887480685470).

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

21220220202210 is a wasteful number, since it uses less digits than its factorization.

21220220202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996275063 (or 3996275060 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21220220202210 its reverse (1220202202212), we get a palindrome (22440422404422).

The spelling of 21220220202210 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty million, two hundred two thousand, two hundred ten".