20021221219 has 24 divisors (see below), whose sum is σ = 20960514848. Its totient is φ = 19109001600.

The previous prime is 20021221211. The next prime is 20021221277. The reversal of 20021221219 is 91212212002.

It is not a de Polignac number, because 20021221219 - 2³ = 20021221211 is a prime.

It is a super-2 number, since 2×20021221219² (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 20021221219.

It is not an unprimeable number, because it can be changed into a prime (20021221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63965407 + ... + 63965719.

Almost surely, 2^20021221219 is an apocalyptic number.

20021221219 is a deficient number, since it is larger than the sum of its proper divisors (939293629).

20021221219 is a wasteful number, since it uses less digits than its factorization.

20021221219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 608 counting only the distinct ones).

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

It can be divided in two parts, 2002 and 1221219, that added together give a palindrome (1223221).

The spelling of 20021221219 in words is "twenty billion, twenty-one million, two hundred twenty-one thousand, two hundred nineteen".