1868310021 has 16 divisors (see below), whose sum is σ = 2520140544. Its totient is φ = 1231071744.

The previous prime is 1868310001. The next prime is 1868310023. The reversal of 1868310021 is 1200138681.

It is not a de Polignac number, because 1868310021 - 2¹⁵ = 1868277253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868310023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116905 + ... + 131921.

It is an arithmetic number, because the mean of its divisors is an integer number (157508784).

Almost surely, 2^1868310021 is an apocalyptic number.

It is an amenable number.

1868310021 is a deficient number, since it is larger than the sum of its proper divisors (651830523).

1868310021 is a wasteful number, since it uses less digits than its factorization.

1868310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15500.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1868310021 is about 43223.9519363975. The cubic root of 1868310021 is about 1231.6377199551.

The spelling of 1868310021 in words is "one billion, eight hundred sixty-eight million, three hundred ten thousand, twenty-one".