1868667021 has 12 divisors (see below), whose sum is σ = 2906815548. Its totient is φ = 1149948864.

The previous prime is 1868667001. The next prime is 1868667023. The reversal of 1868667021 is 1207668681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 423906921 + 1444760100 = 20589^2 + 38010^2 .

It is not a de Polignac number, because 1868667021 - 2⁷ = 1868666893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868667023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7985640 + ... + 7985873.

It is an arithmetic number, because the mean of its divisors is an integer number (242234629).

Almost surely, 2^1868667021 is an apocalyptic number.

It is an amenable number.

1868667021 is a deficient number, since it is larger than the sum of its proper divisors (1038148527).

1868667021 is a wasteful number, since it uses less digits than its factorization.

1868667021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15971532 (or 15971529 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1868667021 is about 43228.0813939273. The cubic root of 1868667021 is about 1231.7161628006.

The spelling of 1868667021 in words is "one billion, eight hundred sixty-eight million, six hundred sixty-seven thousand, twenty-one".