1021020029 has 2 divisors, whose sum is σ = 1021020030. Its totient is φ = 1021020028.

The previous prime is 1021020019. The next prime is 1021020041. The reversal of 1021020029 is 9200201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 943104100 + 77915929 = 30710^2 + 8827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021020029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021019989 and 1021020016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021020019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510014 + 510510015.

It is an arithmetic number, because the mean of its divisors is an integer number (510510015).

Almost surely, 2^1021020029 is an apocalyptic number.

It is an amenable number.

1021020029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020029 is an equidigital number, since it uses as much as digits as its factorization.

1021020029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1021020029 is about 31953.4040283661. The cubic root of 1021020029 is about 1006.9581482120.

The spelling of 1021020029 in words is "one billion, twenty-one million, twenty thousand, twenty-nine".