21010220022212 has 6 divisors (see below), whose sum is σ = 36767885038878. Its totient is φ = 10505110011104.

The previous prime is 21010220022199. The next prime is 21010220022217. The reversal of 21010220022212 is 21222002201012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21004402299136 + 5817723076 = 4583056^2 + 76274^2 .

It is not an unprimeable number, because it can be changed into a prime (21010220022217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626277502773 + ... + 2626277502780.

It is an arithmetic number, because the mean of its divisors is an integer number (6127980839813).

Almost surely, 2^{21010220022212} is an apocalyptic number.

It is an amenable number.

21010220022212 is a deficient number, since it is larger than the sum of its proper divisors (15757665016666).

21010220022212 is a wasteful number, since it uses less digits than its factorization.

21010220022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252555005557 (or 5252555005555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21010220022212 its reverse (21222002201012), we get a palindrome (42232222223224).

The spelling of 21010220022212 in words is "twenty-one trillion, ten billion, two hundred twenty million, twenty-two thousand, two hundred twelve".