1212210022221 has 96 divisors (see below), whose sum is σ = 1975140550656. Its totient is φ = 709959168000.

The previous prime is 1212210022211. The next prime is 1212210022229. The reversal of 1212210022221 is 1222200122121.

It is a happy number.

1212210022221 is a `hidden beast` number, since 1 + 212 + 210 + 0 + 22 + 221 = 666.

It is not a de Polignac number, because 1212210022221 - 2⁶ = 1212210022157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212210022194 and 1212210022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210022229) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 714324445 + ... + 714326141.

It is an arithmetic number, because the mean of its divisors is an integer number (20574380736).

Almost surely, 2^{1212210022221} is an apocalyptic number.

1212210022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212210022221 is a deficient number, since it is larger than the sum of its proper divisors (762930528435).

1212210022221 is a wasteful number, since it uses less digits than its factorization.

1212210022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963 (or 2960 counting only the distinct ones).

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

Adding to 1212210022221 its reverse (1222200122121), we get a palindrome (2434410144342).

The spelling of 1212210022221 in words is "one trillion, two hundred twelve billion, two hundred ten million, twenty-two thousand, two hundred twenty-one".