1221121002212 has 6 divisors (see below), whose sum is σ = 2136961753878. Its totient is φ = 610560501104.

The previous prime is 1221121002209. The next prime is 1221121002259. The reversal of 1221121002212 is 2122001211221.

It can be written as a sum of positive squares in only one way, i.e., 1138416445156 + 82704557056 = 1066966^2 + 287584^2 .

It is a super-2 number, since 2×1221121002212² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152640125273 + ... + 152640125280.

It is an arithmetic number, because the mean of its divisors is an integer number (356160292313).

Almost surely, 2^{1221121002212} is an apocalyptic number.

It is an amenable number.

1221121002212 is a deficient number, since it is larger than the sum of its proper divisors (915840751666).

1221121002212 is a wasteful number, since it uses less digits than its factorization.

1221121002212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305280250557 (or 305280250555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221121002212 its reverse (2122001211221), we get a palindrome (3343122213433).

The spelling of 1221121002212 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two thousand, two hundred twelve".