1020421312015 has 24 divisors (see below), whose sum is σ = 1454731780032. Its totient is φ = 684829857600.

The previous prime is 1020421311989. The next prime is 1020421312019. The reversal of 1020421312015 is 5102131240201.

It is not a de Polignac number, because 1020421312015 - 2⁷ = 1020421311887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020421312019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44296836 + ... + 44319865.

It is an arithmetic number, because the mean of its divisors is an integer number (60613824168).

Almost surely, 2^{1020421312015} is an apocalyptic number.

1020421312015 is a deficient number, since it is larger than the sum of its proper divisors (434310468017).

1020421312015 is an equidigital number, since it uses as much as digits as its factorization.

1020421312015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88616767 (or 88616760 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 1020421312015 its reverse (5102131240201), we get a palindrome (6122552552216).

The spelling of 1020421312015 in words is "one trillion, twenty billion, four hundred twenty-one million, three hundred twelve thousand, fifteen".