20121211219 has 16 divisors (see below), whose sum is σ = 20689675776. Its totient is φ = 19559034400.

The previous prime is 20121211171. The next prime is 20121211267. The reversal of 20121211219 is 91211212102.

It is an interprime number because it is at equal distance from previous prime (20121211171) and next prime (20121211267).

It is a cyclic number.

It is not a de Polignac number, because 20121211219 - 2¹⁹ = 20120686931 is a prime.

It is a super-2 number, since 2×20121211219² (a number of 21 digits) contains 22 as substring.

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 20121211219.

It is not an unprimeable number, because it can be changed into a prime (20121212219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4916364 + ... + 4920454.

It is an arithmetic number, because the mean of its divisors is an integer number (1293104736).

Almost surely, 2^20121211219 is an apocalyptic number.

20121211219 is a deficient number, since it is larger than the sum of its proper divisors (568464557).

20121211219 is a wasteful number, since it uses less digits than its factorization.

20121211219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4826.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 20121211219 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred nineteen".