1238680021 has 4 divisors (see below), whose sum is σ = 1238774752. Its totient is φ = 1238585292.

The previous prime is 1238679997. The next prime is 1238680031. The reversal of 1238680021 is 1200868321.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1238680021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238680031) 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, 23865 + ... + 55198.

It is an arithmetic number, because the mean of its divisors is an integer number (309693688).

Almost surely, 2^1238680021 is an apocalyptic number.

It is an amenable number.

1238680021 is a deficient number, since it is larger than the sum of its proper divisors (94731).

1238680021 is an equidigital number, since it uses as much as digits as its factorization.

1238680021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94730.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1238680021 is about 35194.8862904826. The cubic root of 1238680021 is about 1073.9557253277.

The spelling of 1238680021 in words is "one billion, two hundred thirty-eight million, six hundred eighty thousand, twenty-one".