1221002112212 has 6 divisors (see below), whose sum is σ = 2136753696378. Its totient is φ = 610501056104.

The previous prime is 1221002112191. The next prime is 1221002112233. The reversal of 1221002112212 is 2122112001221.

It is an interprime number because it is at equal distance from previous prime (1221002112191) and next prime (1221002112233).

It can be written as a sum of positive squares in only one way, i.e., 1220574201616 + 427910596 = 1104796^2 + 20686^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152625264023 + ... + 152625264030.

It is an arithmetic number, because the mean of its divisors is an integer number (356125616063).

Almost surely, 2^{1221002112212} is an apocalyptic number.

It is an amenable number.

1221002112212 is a deficient number, since it is larger than the sum of its proper divisors (915751584166).

1221002112212 is a wasteful number, since it uses less digits than its factorization.

1221002112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305250528057 (or 305250528055 counting only the distinct ones).

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

Adding to 1221002112212 its reverse (2122112001221), we get a palindrome (3343114113433).

The spelling of 1221002112212 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twelve thousand, two hundred twelve".