64021143 has 4 divisors (see below), whose sum is σ = 85361528. Its totient is φ = 42680760.

The previous prime is 64021129. The next prime is 64021187. The reversal of 64021143 is 34112046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64021143 - 2⁹ = 64020631 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 (64021103) 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, 10670188 + ... + 10670193.

It is an arithmetic number, because the mean of its divisors is an integer number (21340382).

Almost surely, 2^64021143 is an apocalyptic number.

64021143 is a deficient number, since it is larger than the sum of its proper divisors (21340385).

64021143 is a wasteful number, since it uses less digits than its factorization.

64021143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21340384.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 64021143 is about 8001.3213283807. The cubic root of 64021143 is about 400.0440430670.

Adding to 64021143 its reverse (34112046), we get a palindrome (98133189).

The spelling of 64021143 in words is "sixty-four million, twenty-one thousand, one hundred forty-three".