21222220002012 has 144 divisors (see below), whose sum is σ = 54898437834240. Its totient is φ = 6911063887104.

The previous prime is 21222220001993. The next prime is 21222220002029. The reversal of 21222220002012 is 21020002222212.

21222220002012 is a `hidden beast` number, since 21 + 222 + 220 + 0 + 0 + 201 + 2 = 666.

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

It is a congruent number.

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, 105130008 + ... + 105331680.

Almost surely, 2^{21222220002012} 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 21222220002012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27449218917120).

21222220002012 is an abundant number, since it is smaller than the sum of its proper divisors (33676217832228).

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

21222220002012 is a wasteful number, since it uses less digits than its factorization.

21222220002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202152 (or 202147 counting only the distinct ones).

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

Adding to 21222220002012 its reverse (21020002222212), we get a palindrome (42242222224224).

The spelling of 21222220002012 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, two thousand, twelve".