2021038709 has 4 divisors (see below), whose sum is σ = 2022620160. Its totient is φ = 2019457260.

The previous prime is 2021038673. The next prime is 2021038711. The reversal of 2021038709 is 9078301202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9078301202 = 2 ⋅4539150601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021038709 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 (2021038009) 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, 788807 + ... + 791364.

It is an arithmetic number, because the mean of its divisors is an integer number (505655040).

Almost surely, 2^2021038709 is an apocalyptic number.

It is an amenable number.

2021038709 is a deficient number, since it is larger than the sum of its proper divisors (1581451).

2021038709 is a wasteful number, since it uses less digits than its factorization.

2021038709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581450.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 2021038709 is about 44955.9641093370. The cubic root of 2021038709 is about 1264.3235008668.

The spelling of 2021038709 in words is "two billion, twenty-one million, thirty-eight thousand, seven hundred nine".