1021022021 has 2 divisors, whose sum is σ = 1021022022. Its totient is φ = 1021022020.

The previous prime is 1021021999. The next prime is 1021022033. The reversal of 1021022021 is 1202201201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649689121 + 371332900 = 25489^2 + 19270^2 .

It is an emirp because it is prime and its reverse (1202201201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021022021 - 2²⁶ = 953913157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021021993 and 1021022011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021022071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510511010 + 510511011.

It is an arithmetic number, because the mean of its divisors is an integer number (510511011).

Almost surely, 2^1021022021 is an apocalyptic number.

It is an amenable number.

1021022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021022021 is an equidigital number, since it uses as much as digits as its factorization.

1021022021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1021022021 is about 31953.4351987388. The cubic root of 1021022021 is about 1006.9588030667.

Adding to 1021022021 its reverse (1202201201), we get a palindrome (2223223222).

The spelling of 1021022021 in words is "one billion, twenty-one million, twenty-two thousand, twenty-one".