221020221020212 has 24 divisors (see below), whose sum is σ = 387013512362400. Its totient is φ = 110444933407776.

The previous prime is 221020221020167. The next prime is 221020221020219. The reversal of 221020221020212 is 212020122020122.

It is a super-2 number, since 2×221020221020212² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221020221020212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020221020219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734773339 + ... + 735074077.

It is an arithmetic number, because the mean of its divisors is an integer number (16125563015100).

Almost surely, 2^{221020221020212} is an apocalyptic number.

It is an amenable number.

221020221020212 is a deficient number, since it is larger than the sum of its proper divisors (165993291342188).

221020221020212 is a wasteful number, since it uses less digits than its factorization.

221020221020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408495 (or 408493 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221020221020212 its reverse (212020122020122), we get a palindrome (433040343040334).

The spelling of 221020221020212 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-one million, twenty thousand, two hundred twelve".