221221020200212 has 12 divisors (see below), whose sum is σ = 387139274577076. Its totient is φ = 110609798892480.

The previous prime is 221221020200203. The next prime is 221221020200309. The reversal of 221221020200212 is 212002020122122.

It can be written as a sum of positive squares in 2 ways, for example, as 40461761233936 + 180759258966276 = 6360956^2 + 13444674^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221221020200212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177101739 + ... + 178346482.

Almost surely, 2^{221221020200212} is an apocalyptic number.

It is an amenable number.

221221020200212 is a deficient number, since it is larger than the sum of its proper divisors (165918254376864).

221221020200212 is a wasteful number, since it uses less digits than its factorization.

221221020200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355603818 (or 355603816 counting only the distinct ones).

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

Adding to 221221020200212 its reverse (212002020122122), we get a palindrome (433223040322334).

The spelling of 221221020200212 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, two hundred twelve".