20021222220012 has 144 divisors (see below), whose sum is σ = 54603091303488. Its totient is φ = 6148982730240.

The previous prime is 20021222219993. The next prime is 20021222220031. The reversal of 20021222220012 is 21002222212002.

20021222220012 is a `hidden beast` number, since 20 + 0 + 212 + 222 + 200 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (20021222219993) and next prime (20021222220031).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 744463638 + ... + 744490530.

It is an arithmetic number, because the mean of its divisors is an integer number (379188134052).

Almost surely, 2^{20021222220012} 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 20021222220012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27301545651744).

20021222220012 is an abundant number, since it is smaller than the sum of its proper divisors (34581869083476).

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

20021222220012 is a wasteful number, since it uses less digits than its factorization.

20021222220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29800 (or 29795 counting only the distinct ones).

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

Adding to 20021222220012 its reverse (21002222212002), we get a palindrome (41023444432014).

The spelling of 20021222220012 in words is "twenty trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, twelve".