1021222020 has 192 divisors, whose sum is σ = 3586705920. Its totient is φ = 211341312.

The previous prime is 1021222001. The next prime is 1021222021. The reversal of 1021222020 is 202221201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1021221987 and 1021222005.

It is not an unprimeable number, because it can be changed into a prime (1021222021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 287616 + ... + 291144.

It is an arithmetic number, because the mean of its divisors is an integer number (18680760).

Almost surely, 2^1021222020 is an apocalyptic number.

1021222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793352960).

1021222020 is an abundant number, since it is smaller than the sum of its proper divisors (2565483900).

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

1021222020 is a wasteful number, since it uses less digits than its factorization.

1021222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614 (or 3612 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1021222020 is about 31956.5645838222. The cubic root of 1021222020 is about 1007.0245468676.

Adding to 1021222020 its reverse (202221201), we get a palindrome (1223443221).

The spelling of 1021222020 in words is "one billion, twenty-one million, two hundred twenty-two thousand, twenty".