1921020041 has 2 divisors, whose sum is σ = 1921020042. Its totient is φ = 1921020040.

The previous prime is 1921020019. The next prime is 1921020083. The reversal of 1921020041 is 1400201291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1270566025 + 650454016 = 35645^2 + 25504^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921020041 - 2¹⁴ = 1921003657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921019995 and 1921020022.

It is not a weakly prime, because it can be changed into another prime (1921020341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960510020 + 960510021.

It is an arithmetic number, because the mean of its divisors is an integer number (960510021).

Almost surely, 2^1921020041 is an apocalyptic number.

It is an amenable number.

1921020041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921020041 is an equidigital number, since it uses as much as digits as its factorization.

1921020041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1921020041 is about 43829.4426270743. The cubic root of 1921020041 is about 1243.1130678975.

The spelling of 1921020041 in words is "one billion, nine hundred twenty-one million, twenty thousand, forty-one".