1201222212121 has 4 divisors (see below), whose sum is σ = 1201437915700. Its totient is φ = 1201006508544.

The previous prime is 1201222212007. The next prime is 1201222212137. The reversal of 1201222212121 is 1212122221021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 409042110096 + 792180102025 = 639564^2 + 890045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201222212121 - 2³¹ = 1199074728473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201222212161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107843436 + ... + 107854573.

It is an arithmetic number, because the mean of its divisors is an integer number (300359478925).

Almost surely, 2^{1201222212121} is an apocalyptic number.

It is an amenable number.

1201222212121 is a deficient number, since it is larger than the sum of its proper divisors (215703579).

1201222212121 is an equidigital number, since it uses as much as digits as its factorization.

1201222212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215703578.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1201222212121 its reverse (1212122221021), we get a palindrome (2413344433142).

The spelling of 1201222212121 in words is "one trillion, two hundred one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".