1021000065 has 8 divisors (see below), whose sum is σ = 1633600128. Its totient is φ = 544533360.

The previous prime is 1021000063. The next prime is 1021000073. The reversal of 1021000065 is 5600001201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021000065 - 2¹ = 1021000063 is a prime.

It is a super-2 number, since 2×1021000065² = 2084882265460008450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 68066671 = 1021000065 / (1 + 0 + 2 + 1 + 0 + 0 + 0 + 0 + 6 + 5).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021000063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34033321 + ... + 34033350.

It is an arithmetic number, because the mean of its divisors is an integer number (204200016).

Almost surely, 2^1021000065 is an apocalyptic number.

1021000065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021000065 is a deficient number, since it is larger than the sum of its proper divisors (612600063).

1021000065 is an equidigital number, since it uses as much as digits as its factorization.

1021000065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68066679.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1021000065 is about 31953.0916344569. The cubic root of 1021000065 is about 1006.9515851531.

Adding to 1021000065 its reverse (5600001201), we get a palindrome (6621001266).

The spelling of 1021000065 in words is "one billion, twenty-one million, sixty-five", and thus it is an aban number and an uban number.