1212122200221 has 32 divisors (see below), whose sum is σ = 1938426336000. Its totient is φ = 746294117184.

The previous prime is 1212122200217. The next prime is 1212122200259. The reversal of 1212122200221 is 1220022212121.

It is a happy number.

1212122200221 is a `hidden beast` number, since 1 + 212 + 12 + 220 + 0 + 221 = 666.

It is not a de Polignac number, because 1212122200221 - 2² = 1212122200217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212122200194 and 1212122200203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212122200291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33635226 + ... + 33671243.

It is an arithmetic number, because the mean of its divisors is an integer number (60575823000).

Almost surely, 2^{1212122200221} is an apocalyptic number.

It is an amenable number.

1212122200221 is a deficient number, since it is larger than the sum of its proper divisors (726304135779).

1212122200221 is a wasteful number, since it uses less digits than its factorization.

1212122200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67306530 (or 67306524 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212122200221 its reverse (1220022212121), we get a palindrome (2432144412342).

The spelling of 1212122200221 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred thousand, two hundred twenty-one".