8137748021 has 8 divisors (see below), whose sum is σ = 8821768704. Its totient is φ = 7462018800.

The previous prime is 8137748011. The next prime is 8137748023. The reversal of 8137748021 is 1208477318.

8137748021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8137748021 - 2¹⁸ = 8137485877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8137748021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8137748023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070821 + ... + 2074746.

It is an arithmetic number, because the mean of its divisors is an integer number (1102721088).

Almost surely, 2^8137748021 is an apocalyptic number.

It is an amenable number.

8137748021 is a deficient number, since it is larger than the sum of its proper divisors (684020683).

8137748021 is a wasteful number, since it uses less digits than its factorization.

8137748021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145731.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 8137748021 is about 90209.4674687751. The cubic root of 8137748021 is about 2011.4137410981.

The spelling of 8137748021 in words is "eight billion, one hundred thirty-seven million, seven hundred forty-eight thousand, twenty-one".