2001212222220 has 144 divisors (see below), whose sum is σ = 6095571719328. Its totient is φ = 531440870400.

The previous prime is 2001212222143. The next prime is 2001212222263. The reversal of 2001212222220 is 222222121002.

2001212222220 is a `hidden beast` number, since 200 + 1 + 21 + 2 + 222 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2001212222193 and 2001212222202.

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, 101056320 + ... + 101076120.

It is an arithmetic number, because the mean of its divisors is an integer number (42330359162).

Almost surely, 2^{2001212222220} is an apocalyptic number.

2001212222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001212222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047785859664).

2001212222220 is an abundant number, since it is smaller than the sum of its proper divisors (4094359497108).

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

2001212222220 is a wasteful number, since it uses less digits than its factorization.

2001212222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22120 (or 22115 counting only the distinct ones).

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

Adding to 2001212222220 its reverse (222222121002), we get a palindrome (2223434343222).

The spelling of 2001212222220 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty".