2042186621 has 4 divisors (see below), whose sum is σ = 2097380892. Its totient is φ = 1986992352.

The previous prime is 2042186617. The next prime is 2042186623. The reversal of 2042186621 is 1266812402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1266812402 = 2 ⋅633406201.

It can be written as a sum of positive squares in 2 ways, for example, as 1109556100 + 932630521 = 33310^2 + 30539^2 .

It is not a de Polignac number, because 2042186621 - 2² = 2042186617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042186623) 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, 27597080 + ... + 27597153.

It is an arithmetic number, because the mean of its divisors is an integer number (524345223).

Almost surely, 2^2042186621 is an apocalyptic number.

It is an amenable number.

2042186621 is a deficient number, since it is larger than the sum of its proper divisors (55194271).

2042186621 is an equidigital number, since it uses as much as digits as its factorization.

2042186621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55194270.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2042186621 is about 45190.5589808314. The cubic root of 2042186621 is about 1268.7181190077.

The spelling of 2042186621 in words is "two billion, forty-two million, one hundred eighty-six thousand, six hundred twenty-one".