2001212221122 has 48 divisors (see below), whose sum is σ = 4381273260000. Its totient is φ = 660101366016.

The previous prime is 2001212221121. The next prime is 2001212221123. The reversal of 2001212221122 is 2211222121002.

It is a happy number.

2001212221122 is a `hidden beast` number, since 200 + 121 + 2 + 221 + 122 = 666.

It is an interprime number because it is at equal distance from previous prime (2001212221121) and next prime (2001212221123).

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 = 2001212221095 and 2001212221104.

It is not an unprimeable number, because it can be changed into a prime (2001212221121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13016833 + ... + 13169675.

It is an arithmetic number, because the mean of its divisors is an integer number (91276526250).

Almost surely, 2^{2001212221122} is an apocalyptic number.

2001212221122 is an abundant number, since it is smaller than the sum of its proper divisors (2380061038878).

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

2001212221122 is a wasteful number, since it uses less digits than its factorization.

2001212221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160447 (or 160444 counting only the distinct ones).

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

Adding to 2001212221122 its reverse (2211222121002), we get a palindrome (4212434342124).

The spelling of 2001212221122 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twenty-two".