1221212010219 has 4 divisors (see below), whose sum is σ = 1628282680296. Its totient is φ = 814141340144.

The previous prime is 1221212010191. The next prime is 1221212010241. The reversal of 1221212010219 is 9120102121221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221212010219 - 2¹² = 1221212006123 is a prime.

It is a super-2 number, since 2×1221212010219² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221212010719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203535335034 + ... + 203535335039.

It is an arithmetic number, because the mean of its divisors is an integer number (407070670074).

Almost surely, 2^{1221212010219} is an apocalyptic number.

1221212010219 is a deficient number, since it is larger than the sum of its proper divisors (407070670077).

1221212010219 is an equidigital number, since it uses as much as digits as its factorization.

1221212010219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407070670076.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 1221212010219 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, ten thousand, two hundred nineteen".