1021420957 has 2 divisors, whose sum is σ = 1021420958. Its totient is φ = 1021420956.

The previous prime is 1021420937. The next prime is 1021420969. The reversal of 1021420957 is 7590241201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620059801 + 401361156 = 24901^2 + 20034^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021420957 - 2¹⁵ = 1021388189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021420937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510710478 + 510710479.

It is an arithmetic number, because the mean of its divisors is an integer number (510710479).

Almost surely, 2^1021420957 is an apocalyptic number.

It is an amenable number.

1021420957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021420957 is an equidigital number, since it uses as much as digits as its factorization.

1021420957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1021420957 is about 31959.6770478051. The cubic root of 1021420957 is about 1007.0899330524.

The spelling of 1021420957 in words is "one billion, twenty-one million, four hundred twenty thousand, nine hundred fifty-seven".