1027043021 has 2 divisors, whose sum is σ = 1027043022. Its totient is φ = 1027043020.

The previous prime is 1027043009. The next prime is 1027043023. The reversal of 1027043021 is 1203407201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840420100 + 186622921 = 28990^2 + 13661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1027043021 - 2¹⁸ = 1026780877 is a prime.

Together with 1027043023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1027042984 and 1027043002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1027043023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513521510 + 513521511.

It is an arithmetic number, because the mean of its divisors is an integer number (513521511).

Almost surely, 2^1027043021 is an apocalyptic number.

It is an amenable number.

1027043021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1027043021 is an equidigital number, since it uses as much as digits as its factorization.

1027043021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1027043021 is about 32047.5119315057. The cubic root of 1027043021 is about 1008.9342812366.

The spelling of 1027043021 in words is "one billion, twenty-seven million, forty-three thousand, twenty-one".