1212011202221 has 4 divisors (see below), whose sum is σ = 1264707341472. Its totient is φ = 1159315062972.

The previous prime is 1212011202169. The next prime is 1212011202239. The reversal of 1212011202221 is 1222021102121.

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 1212011202221 - 2³⁸ = 937133295277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212011202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011201221) 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, 26348069591 + ... + 26348069636.

It is an arithmetic number, because the mean of its divisors is an integer number (316176835368).

Almost surely, 2^{1212011202221} is an apocalyptic number.

It is an amenable number.

1212011202221 is a deficient number, since it is larger than the sum of its proper divisors (52696139251).

1212011202221 is an equidigital number, since it uses as much as digits as its factorization.

1212011202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52696139250.

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

Adding to 1212011202221 its reverse (1222021102121), we get a palindrome (2434032304342).

The spelling of 1212011202221 in words is "one trillion, two hundred twelve billion, eleven million, two hundred two thousand, two hundred twenty-one".