1021202221212 has 36 divisors (see below), whose sum is σ = 2581450908400. Its totient is φ = 340390372032.

The previous prime is 1021202221201. The next prime is 1021202221217. The reversal of 1021202221212 is 2121222021201.

It is a happy number.

1021202221212 is a `hidden beast` number, since 10 + 21 + 202 + 221 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021202221217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 815664 + ... + 1645512.

Almost surely, 2^{1021202221212} is an apocalyptic number.

1021202221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021202221212 is an abundant number, since it is smaller than the sum of its proper divisors (1560248687188).

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

1021202221212 is a wasteful number, since it uses less digits than its factorization.

1021202221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864042 (or 864037 counting only the distinct ones).

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

Adding to 1021202221212 its reverse (2121222021201), we get a palindrome (3142424242413).

The spelling of 1021202221212 in words is "one trillion, twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred twelve".