8638156021 has 8 divisors (see below), whose sum is σ = 9748389600. Its totient is φ = 7582080240.

The previous prime is 8638156019. The next prime is 8638156031. The reversal of 8638156021 is 1206518368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8638156021 - 2¹ = 8638156019 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 (8638156001) 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 7 ways as a sum of consecutive naturals, for example, 13539111 + ... + 13539748.

It is an arithmetic number, because the mean of its divisors is an integer number (1218548700).

Almost surely, 2^8638156021 is an apocalyptic number.

It is an amenable number.

8638156021 is a deficient number, since it is larger than the sum of its proper divisors (1110233579).

8638156021 is a wasteful number, since it uses less digits than its factorization.

8638156021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27078899.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 8638156021 is about 92941.6807519640. The cubic root of 8638156021 is about 2051.8251460082.

The spelling of 8638156021 in words is "eight billion, six hundred thirty-eight million, one hundred fifty-six thousand, twenty-one".