1021021997 has 2 divisors, whose sum is σ = 1021021998. Its totient is φ = 1021021996.

The previous prime is 1021021979. The next prime is 1021021999. The reversal of 1021021997 is 7991201201.

Together with previous prime (1021021979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800380681 + 220641316 = 28291^2 + 14854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021021997 - 2¹² = 1021017901 is a prime.

Together with 1021021999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021021999) 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 as a sum of consecutive naturals, namely, 510510998 + 510510999.

It is an arithmetic number, because the mean of its divisors is an integer number (510510999).

Almost surely, 2^1021021997 is an apocalyptic number.

It is an amenable number.

1021021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021021997 is an equidigital number, since it uses as much as digits as its factorization.

1021021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 1021021997 is about 31953.4348231923. The cubic root of 1021021997 is about 1006.9587951769.

The spelling of 1021021997 in words is "one billion, twenty-one million, twenty-one thousand, nine hundred ninety-seven".