21065207143 has 4 divisors (see below), whose sum is σ = 21174353488. Its totient is φ = 20956060800.

The previous prime is 21065207117. The next prime is 21065207153. The reversal of 21065207143 is 34170256012.

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

It is a cyclic number.

It is not a de Polignac number, because 21065207143 - 2¹³ = 21065198951 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 (21065207153) 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, 54572883 + ... + 54573268.

It is an arithmetic number, because the mean of its divisors is an integer number (5293588372).

Almost surely, 2^21065207143 is an apocalyptic number.

21065207143 is a deficient number, since it is larger than the sum of its proper divisors (109146345).

21065207143 is a wasteful number, since it uses less digits than its factorization.

21065207143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109146344.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21065207143 in words is "twenty-one billion, sixty-five million, two hundred seven thousand, one hundred forty-three".