20042221212 has 144 divisors (see below), whose sum is σ = 57508971520. Its totient is φ = 5834332800.

The previous prime is 20042221207. The next prime is 20042221217. The reversal of 20042221212 is 21212224002.

20042221212 is a `hidden beast` number, since 20 + 0 + 422 + 212 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (20042221207) and next prime (20042221217).

It is a super-2 number, since 2×20042221212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042221217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10945137 + ... + 10946967.

Almost surely, 2^20042221212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20042221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28754485760).

20042221212 is an abundant number, since it is smaller than the sum of its proper divisors (37466750308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20042221212 is a wasteful number, since it uses less digits than its factorization.

20042221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20042221212 its reverse (21212224002), we get a palindrome (41254445214).

The spelling of 20042221212 in words is "twenty billion, forty-two million, two hundred twenty-one thousand, two hundred twelve".