20121220219 has 4 divisors (see below), whose sum is σ = 20121557544. Its totient is φ = 20120882896.

The previous prime is 20121220187. The next prime is 20121220241. The reversal of 20121220219 is 91202212102.

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 20121220219 - 2⁵ = 20121220187 is a prime.

It is a super-2 number, since 2×20121220219² (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 20121220219.

It is not an unprimeable number, because it can be changed into a prime (20121220279) 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, 52537 + ... + 207370.

It is an arithmetic number, because the mean of its divisors is an integer number (5030389386).

Almost surely, 2^20121220219 is an apocalyptic number.

20121220219 is a deficient number, since it is larger than the sum of its proper divisors (337325).

20121220219 is an equidigital number, since it uses as much as digits as its factorization.

20121220219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337324.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20121220219 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred nineteen".