4042057621 has 4 divisors (see below), whose sum is σ = 4619494432. Its totient is φ = 3464620812.

The previous prime is 4042057601. The next prime is 4042057639. The reversal of 4042057621 is 1267502404.

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 4042057621 - 2⁷ = 4042057493 is a prime.

It is a super-2 number, since 2×4042057621² = 32676459622968359282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042057601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288718395 + ... + 288718408.

It is an arithmetic number, because the mean of its divisors is an integer number (1154873608).

Almost surely, 2^4042057621 is an apocalyptic number.

It is an amenable number.

4042057621 is a deficient number, since it is larger than the sum of its proper divisors (577436811).

4042057621 is an equidigital number, since it uses as much as digits as its factorization.

4042057621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577436810.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 4042057621 is about 63577.1784605136. The cubic root of 4042057621 is about 1592.9451920057.

The spelling of 4042057621 in words is "four billion, forty-two million, fifty-seven thousand, six hundred twenty-one".