1021021221222 has 40 divisors (see below), whose sum is σ = 2366735025600. Its totient is φ = 328604529456.

The previous prime is 1021021221211. The next prime is 1021021221223. The reversal of 1021021221222 is 2221221201201.

It is a happy number.

1021021221222 is a `hidden beast` number, since 1 + 0 + 210 + 212 + 21 + 222 = 666.

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 = 1021021221195 and 1021021221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021221223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 108660822 + ... + 108670217.

It is an arithmetic number, because the mean of its divisors is an integer number (59168375640).

Almost surely, 2^{1021021221222} is an apocalyptic number.

1021021221222 is an abundant number, since it is smaller than the sum of its proper divisors (1345713804378).

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

1021021221222 is a wasteful number, since it uses less digits than its factorization.

1021021221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217331082 (or 217331073 counting only the distinct ones).

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

Adding to 1021021221222 its reverse (2221221201201), we get a palindrome (3242242422423).

The spelling of 1021021221222 in words is "one trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".