221121122020212 has 24 divisors (see below), whose sum is σ = 515953720108512. Its totient is φ = 73706407045600.

The previous prime is 221121122020133. The next prime is 221121122020259. The reversal of 221121122020212 is 212020221121122.

It is a super-2 number, since 2×221121122020212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77748339 + ... + 80542202.

It is an arithmetic number, because the mean of its divisors is an integer number (21498071671188).

Almost surely, 2^{221121122020212} is an apocalyptic number.

It is an amenable number.

221121122020212 is an abundant number, since it is smaller than the sum of its proper divisors (294832598088300).

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

221121122020212 is a wasteful number, since it uses less digits than its factorization.

221121122020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158406959 (or 158406957 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221121122020212 its reverse (212020221121122), we get a palindrome (433141343141334).

The spelling of 221121122020212 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, twenty thousand, two hundred twelve".