2011212212220 has 72 divisors (see below), whose sum is σ = 6204078382320. Its totient is φ = 527233029120.

The previous prime is 2011212212209. The next prime is 2011212212231. The reversal of 2011212212220 is 222122121102.

It is a happy number.

2011212212220 is a `hidden beast` number, since 20 + 1 + 1 + 212 + 212 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (2011212212209) and next prime (2011212212231).

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 = 2011212212193 and 2011212212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94679221 + ... + 94700460.

It is an arithmetic number, because the mean of its divisors is an integer number (86167755310).

Almost surely, 2^{2011212212220} is an apocalyptic number.

2011212212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011212212220 is an abundant number, since it is smaller than the sum of its proper divisors (4192866170100).

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

2011212212220 is a wasteful number, since it uses less digits than its factorization.

2011212212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189379755 (or 189379750 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2011212212220 its reverse (222122121102), we get a palindrome (2233334333322).

The spelling of 2011212212220 in words is "two trillion, eleven billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty".