8457736021 has 16 divisors (see below), whose sum is σ = 9744912000. Its totient is φ = 7190434368.

The previous prime is 8457736009. The next prime is 8457736033. The reversal of 8457736021 is 1206377548.

It is an interprime number because it is at equal distance from previous prime (8457736009) and next prime (8457736033).

It is a cyclic number.

It is not a de Polignac number, because 8457736021 - 2¹³ = 8457727829 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 (8457736321) 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, 765291 + ... + 776263.

It is an arithmetic number, because the mean of its divisors is an integer number (609057000).

Almost surely, 2^8457736021 is an apocalyptic number.

It is an amenable number.

8457736021 is a deficient number, since it is larger than the sum of its proper divisors (1287175979).

8457736021 is a wasteful number, since it uses less digits than its factorization.

8457736021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11868.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 8457736021 is about 91965.9503348930. The cubic root of 8457736021 is about 2037.4394393331.

The spelling of 8457736021 in words is "eight billion, four hundred fifty-seven million, seven hundred thirty-six thousand, twenty-one".