2021392424845 has 4 divisors (see below), whose sum is σ = 2425670909820. Its totient is φ = 1617113939872.

The previous prime is 2021392424813. The next prime is 2021392424873. The reversal of 2021392424845 is 5484242931202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215233828489 + 1806158596356 = 463933^2 + 1343934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021392424845 - 2⁵ = 2021392424813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021392424795 and 2021392424804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202139242480 + ... + 202139242489.

It is an arithmetic number, because the mean of its divisors is an integer number (606417727455).

Almost surely, 2^{2021392424845} is an apocalyptic number.

It is an amenable number.

2021392424845 is a deficient number, since it is larger than the sum of its proper divisors (404278484975).

2021392424845 is an equidigital number, since it uses as much as digits as its factorization.

2021392424845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404278484974.

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 2021392424845 in words is "two trillion, twenty-one billion, three hundred ninety-two million, four hundred twenty-four thousand, eight hundred forty-five".