2027457821 has 4 divisors (see below), whose sum is σ = 2027850492. Its totient is φ = 2027065152.

The previous prime is 2027457811. The next prime is 2027457829. The reversal of 2027457821 is 1287547202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1516245721 + 511212100 = 38939^2 + 22610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2027457821 - 2¹⁰ = 2027456797 is a prime.

It is a super-2 number, since 2×2027457821² = 8221170431868136082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2027457829) 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, 188486 + ... + 198951.

It is an arithmetic number, because the mean of its divisors is an integer number (506962623).

Almost surely, 2^2027457821 is an apocalyptic number.

It is an amenable number.

2027457821 is a deficient number, since it is larger than the sum of its proper divisors (392671).

2027457821 is an equidigital number, since it uses as much as digits as its factorization.

2027457821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392670.

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 2027457821 is about 45027.3008407122. The cubic root of 2027457821 is about 1265.6606444676.

The spelling of 2027457821 in words is "two billion, twenty-seven million, four hundred fifty-seven thousand, eight hundred twenty-one".