1010021669 has 2 divisors, whose sum is σ = 1010021670. Its totient is φ = 1010021668.

The previous prime is 1010021653. The next prime is 1010021699. The reversal of 1010021669 is 9661200101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739024225 + 270997444 = 27185^2 + 16462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010021669 - 2⁴ = 1010021653 is a prime.

It is a super-2 number, since 2×1010021669² = 2040287543699091122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010021699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505010834 + 505010835.

It is an arithmetic number, because the mean of its divisors is an integer number (505010835).

Almost surely, 2^1010021669 is an apocalyptic number.

It is an amenable number.

1010021669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010021669 is an equidigital number, since it uses as much as digits as its factorization.

1010021669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1010021669 is about 31780.8380789431. The cubic root of 1010021669 is about 1003.3294587352.

The spelling of 1010021669 in words is "one billion, ten million, twenty-one thousand, six hundred sixty-nine".