2021012515 has 24 divisors (see below), whose sum is σ = 2479027824. Its totient is φ = 1581652800.

The previous prime is 2021012473. The next prime is 2021012531. The reversal of 2021012515 is 5152101202.

It is a de Polignac number, because none of the positive numbers 2^k-2021012515 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021012492 and 2021012501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4561884 + ... + 4562326.

It is an arithmetic number, because the mean of its divisors is an integer number (103292826).

Almost surely, 2^2021012515 is an apocalyptic number.

2021012515 is a deficient number, since it is larger than the sum of its proper divisors (458015309).

2021012515 is an equidigital number, since it uses as much as digits as its factorization.

2021012515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2021012515 is about 44955.6727788607. The cubic root of 2021012515 is about 1264.3180386866.

Adding to 2021012515 its reverse (5152101202), we get a palindrome (7173113717).

The spelling of 2021012515 in words is "two billion, twenty-one million, twelve thousand, five hundred fifteen".