2055040621 has 4 divisors (see below), whose sum is σ = 2055726144. Its totient is φ = 2054355100.

The previous prime is 2055040607. The next prime is 2055040657. The reversal of 2055040621 is 1260405502.

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 2055040621 - 2¹⁹ = 2054516333 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 (2055040681) 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, 338245 + ... + 344266.

It is an arithmetic number, because the mean of its divisors is an integer number (513931536).

Almost surely, 2^2055040621 is an apocalyptic number.

It is an amenable number.

2055040621 is a deficient number, since it is larger than the sum of its proper divisors (685523).

2055040621 is an equidigital number, since it uses as much as digits as its factorization.

2055040621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685522.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2055040621 is about 45332.5558622057. Note that the first 3 decimals coincide. The cubic root of 2055040621 is about 1271.3744231230.

The spelling of 2055040621 in words is "two billion, fifty-five million, forty thousand, six hundred twenty-one".