1021208408065 has 16 divisors (see below), whose sum is σ = 1276296721920. Its totient is φ = 783690949440.

The previous prime is 1021208408047. The next prime is 1021208408081. The reversal of 1021208408065 is 5608048021201.

It is a de Polignac number, because none of the positive numbers 2^k-1021208408065 is a prime.

It is a super-2 number, since 2×1021208408065² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38860425 + ... + 38886694.

It is an arithmetic number, because the mean of its divisors is an integer number (79768545120).

Almost surely, 2^{1021208408065} is an apocalyptic number.

It is an amenable number.

1021208408065 is a deficient number, since it is larger than the sum of its proper divisors (255088313855).

1021208408065 is an equidigital number, since it uses as much as digits as its factorization.

1021208408065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77747232.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 1021208408065 in words is "one trillion, twenty-one billion, two hundred eight million, four hundred eight thousand, sixty-five".