1021020019 has 2 divisors, whose sum is σ = 1021020020. Its totient is φ = 1021020018.

The previous prime is 1021019977. The next prime is 1021020029. The reversal of 1021020019 is 9100201201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021020019 - 2²¹ = 1018922867 is a prime.

It is a super-2 number, since 2×1021020019² = 2084963758397520722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021019984 and 1021020011.

It is not a weakly prime, because it can be changed into another prime (1021020029) 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, 510510009 + 510510010.

It is an arithmetic number, because the mean of its divisors is an integer number (510510010).

Almost surely, 2^1021020019 is an apocalyptic number.

1021020019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020019 is an equidigital number, since it uses as much as digits as its factorization.

1021020019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1021020019 is about 31953.4038718882. The cubic root of 1021020019 is about 1006.9581449245.

The spelling of 1021020019 in words is "one billion, twenty-one million, twenty thousand, nineteen".