1221002122212 has 18 divisors (see below), whose sum is σ = 3086422031238. Its totient is φ = 407000707392.

The previous prime is 1221002122183. The next prime is 1221002122231. The reversal of 1221002122212 is 2122212001221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1181012521536 + 39989600676 = 1086744^2 + 199974^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16958362773 + ... + 16958362844.

Almost surely, 2^{1221002122212} is an apocalyptic number.

1221002122212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221002122212 is an abundant number, since it is smaller than the sum of its proper divisors (1865419909026).

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

1221002122212 is a wasteful number, since it uses less digits than its factorization.

1221002122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33916725627 (or 33916725622 counting only the distinct ones).

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

Adding to 1221002122212 its reverse (2122212001221), we get a palindrome (3343214123433).

The spelling of 1221002122212 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty-two thousand, two hundred twelve".