1021202121222 has 16 divisors (see below), whose sum is σ = 2269338047280. Its totient is φ = 340400707056.

The previous prime is 1021202121217. The next prime is 1021202121223. The reversal of 1021202121222 is 2221212021201.

It is a happy number.

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 = 1021202121195 and 1021202121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021202121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9455575143 + ... + 9455575250.

It is an arithmetic number, because the mean of its divisors is an integer number (141833627955).

Almost surely, 2^{1021202121222} is an apocalyptic number.

1021202121222 is an abundant number, since it is smaller than the sum of its proper divisors (1248135926058).

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

1021202121222 is a wasteful number, since it uses less digits than its factorization.

1021202121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18911150404 (or 18911150398 counting only the distinct ones).

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

Adding to 1021202121222 its reverse (2221212021201), we get a palindrome (3242414142423).

The spelling of 1021202121222 in words is "one trillion, twenty-one billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-two".