2021125572517 has 4 divisors (see below), whose sum is σ = 2021135958496. Its totient is φ = 2021115186540.

The previous prime is 2021125572491. The next prime is 2021125572523. The reversal of 2021125572517 is 7152755211202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021125572517 - 2³⁹ = 1471369758629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021125572517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021125572577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4895403 + ... + 5292184.

It is an arithmetic number, because the mean of its divisors is an integer number (505283989624).

Almost surely, 2^{2021125572517} is an apocalyptic number.

It is an amenable number.

2021125572517 is a deficient number, since it is larger than the sum of its proper divisors (10385979).

2021125572517 is a wasteful number, since it uses less digits than its factorization.

2021125572517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10385978.

The product of its (nonzero) digits is 98000, while the sum is 40.

The spelling of 2021125572517 in words is "two trillion, twenty-one billion, one hundred twenty-five million, five hundred seventy-two thousand, five hundred seventeen".