2061705621 has 4 divisors (see below), whose sum is σ = 2748940832. Its totient is φ = 1374470412.

The previous prime is 2061705571. The next prime is 2061705629. The reversal of 2061705621 is 1265071602.

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 not a de Polignac number, because 2061705621 - 2⁶ = 2061705557 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 (2061705629) 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, 343617601 + ... + 343617606.

It is an arithmetic number, because the mean of its divisors is an integer number (687235208).

Almost surely, 2^2061705621 is an apocalyptic number.

It is an amenable number.

2061705621 is a deficient number, since it is larger than the sum of its proper divisors (687235211).

2061705621 is an equidigital number, since it uses as much as digits as its factorization.

2061705621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687235210.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 2061705621 is about 45406.0086442312. The cubic root of 2061705621 is about 1272.7473994268.

The spelling of 2061705621 in words is "two billion, sixty-one million, seven hundred five thousand, six hundred twenty-one".