5640506421 has 32 divisors (see below), whose sum is σ = 8765145600. Its totient is φ = 3190207680.

The previous prime is 5640506401. The next prime is 5640506423. The reversal of 5640506421 is 1246050465.

5640506421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5640506421 - 2⁶ = 5640506357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640506423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25126 + ... + 109143.

It is an arithmetic number, because the mean of its divisors is an integer number (273910800).

Almost surely, 2^5640506421 is an apocalyptic number.

It is an amenable number.

5640506421 is a deficient number, since it is larger than the sum of its proper divisors (3124639179).

5640506421 is a wasteful number, since it uses less digits than its factorization.

5640506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134369.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 5640506421 is about 75103.3049938550. The cubic root of 5640506421 is about 1780.0793657538.

Adding to 5640506421 its reverse (1246050465), we get a palindrome (6886556886).

The spelling of 5640506421 in words is "five billion, six hundred forty million, five hundred six thousand, four hundred twenty-one".