2021515310021 has 16 divisors (see below), whose sum is σ = 2131317178368. Its totient is φ = 1914507975600.

The previous prime is 2021515310011. The next prime is 2021515310093. The reversal of 2021515310021 is 1200135151202.

It is a cyclic number.

It is not a de Polignac number, because 2021515310021 - 2³⁴ = 2004335440837 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 (2021515310011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17734616 + ... + 17848238.

It is an arithmetic number, because the mean of its divisors is an integer number (133207323648).

Almost surely, 2^{2021515310021} is an apocalyptic number.

It is an amenable number.

2021515310021 is a deficient number, since it is larger than the sum of its proper divisors (109801868347).

2021515310021 is a wasteful number, since it uses less digits than its factorization.

2021515310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125912.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 2021515310021 in words is "two trillion, twenty-one billion, five hundred fifteen million, three hundred ten thousand, twenty-one".