1212202112221 has 4 divisors (see below), whose sum is σ = 1223531104032. Its totient is φ = 1200873120412.

The previous prime is 1212202112141. The next prime is 1212202112281. The reversal of 1212202112221 is 1222112022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212202112221 - 2¹⁵ = 1212202079453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202112281) 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, 5664495745 + ... + 5664495958.

It is an arithmetic number, because the mean of its divisors is an integer number (305882776008).

Almost surely, 2^{1212202112221} is an apocalyptic number.

It is an amenable number.

1212202112221 is a deficient number, since it is larger than the sum of its proper divisors (11328991811).

1212202112221 is a wasteful number, since it uses less digits than its factorization.

1212202112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11328991810.

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

Adding to 1212202112221 its reverse (1222112022121), we get a palindrome (2434314134342).

It can be divided in two parts, 121220 and 2112221, that added together give a triangular number (2233441 = T₂₁₁₃).

The spelling of 1212202112221 in words is "one trillion, two hundred twelve billion, two hundred two million, one hundred twelve thousand, two hundred twenty-one".