2021373517 has 4 divisors (see below), whose sum is σ = 2027371996. Its totient is φ = 2015375040.

The previous prime is 2021373503. The next prime is 2021373533. The reversal of 2021373517 is 7153731202.

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 1253584836 + 767788681 = 35406^2 + 27709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021373517 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 (2021373547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2998734 + ... + 2999407.

It is an arithmetic number, because the mean of its divisors is an integer number (506842999).

Almost surely, 2^2021373517 is an apocalyptic number.

It is an amenable number.

2021373517 is a deficient number, since it is larger than the sum of its proper divisors (5998479).

2021373517 is an equidigital number, since it uses as much as digits as its factorization.

2021373517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998478.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 2021373517 is about 44959.6876879722. The cubic root of 2021373517 is about 1264.3933135243.

The spelling of 2021373517 in words is "two billion, twenty-one million, three hundred seventy-three thousand, five hundred seventeen".