21606054143 has 4 divisors (see below), whose sum is σ = 21607175928. Its totient is φ = 21604932360.

The previous prime is 21606054139. The next prime is 21606054181. The reversal of 21606054143 is 34145060612.

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 21606054143 - 2² = 21606054139 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 (21606054343) 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, 531488 + ... + 570693.

It is an arithmetic number, because the mean of its divisors is an integer number (5401793982).

Almost surely, 2^21606054143 is an apocalyptic number.

21606054143 is a deficient number, since it is larger than the sum of its proper divisors (1121785).

21606054143 is a wasteful number, since it uses less digits than its factorization.

21606054143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121784.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21606054143 in words is "twenty-one billion, six hundred six million, fifty-four thousand, one hundred forty-three".