1001212221222 has 48 divisors (see below), whose sum is σ = 2206640743632. Its totient is φ = 328000484160.

The previous prime is 1001212221203. The next prime is 1001212221223. The reversal of 1001212221222 is 2221222121001.

It is a happy number.

1001212221222 is a `hidden beast` number, since 10 + 0 + 1 + 212 + 221 + 222 = 666.

1001212221222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 1001212221195 and 1001212221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212221223) 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, 989653 + ... + 1726799.

It is an arithmetic number, because the mean of its divisors is an integer number (45971682159).

Almost surely, 2^{1001212221222} is an apocalyptic number.

1001212221222 is an abundant number, since it is smaller than the sum of its proper divisors (1205428522410).

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

1001212221222 is a wasteful number, since it uses less digits than its factorization.

1001212221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738453 (or 738450 counting only the distinct ones).

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

Adding to 1001212221222 its reverse (2221222121001), we get a palindrome (3222434342223).

The spelling of 1001212221222 in words is "one trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".