1222002212121 has 12 divisors (see below), whose sum is σ = 1781308017060. Its totient is φ = 807194121120.

The previous prime is 1222002212117. The next prime is 1222002212203. The reversal of 1222002212121 is 1212122002221.

It is a happy number.

1222002212121 is a `hidden beast` number, since 12 + 220 + 0 + 221 + 212 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 904041557721 + 317960654400 = 950811^2 + 563880^2 .

It is not a de Polignac number, because 1222002212121 - 2² = 1222002212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222002212094 and 1222002212103.

It is not an unprimeable number, because it can be changed into a prime (1222002212621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622833990 + ... + 622835951.

It is an arithmetic number, because the mean of its divisors is an integer number (148442334755).

Almost surely, 2^{1222002212121} is an apocalyptic number.

It is an amenable number.

1222002212121 is a deficient number, since it is larger than the sum of its proper divisors (559305804939).

1222002212121 is a wasteful number, since it uses less digits than its factorization.

1222002212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245670056 (or 1245670053 counting only the distinct ones).

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

Adding to 1222002212121 its reverse (1212122002221), we get a palindrome (2434124214342).

The spelling of 1222002212121 in words is "one trillion, two hundred twenty-two billion, two million, two hundred twelve thousand, one hundred twenty-one".