1021221020212 has 72 divisors (see below), whose sum is σ = 1915527539016. Its totient is φ = 476225796096.

The previous prime is 1021221020207. The next prime is 1021221020213. The reversal of 1021221020212 is 2120201221201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1270494736 + 1019950525476 = 35644^2 + 1009926^2 .

It is a super-2 number, since 2×1021221020212² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221020213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58705788 + ... + 58723180.

It is an arithmetic number, because the mean of its divisors is an integer number (26604549153).

Almost surely, 2^{1021221020212} is an apocalyptic number.

It is an amenable number.

1021221020212 is a deficient number, since it is larger than the sum of its proper divisors (894306518804).

1021221020212 is a wasteful number, since it uses less digits than its factorization.

1021221020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18065 (or 18044 counting only the distinct ones).

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

Adding to 1021221020212 its reverse (2120201221201), we get a palindrome (3141422241413).

The spelling of 1021221020212 in words is "one trillion, twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred twelve".