21628214743 has 4 divisors (see below), whose sum is σ = 21635606880. Its totient is φ = 21620822608.

The previous prime is 21628214731. The next prime is 21628214771. The reversal of 21628214743 is 34741282612.

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 21628214743 - 2²⁹ = 21091343831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21628214696 and 21628214705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21628274743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3691678 + ... + 3697531.

It is an arithmetic number, because the mean of its divisors is an integer number (5408901720).

Almost surely, 2^21628214743 is an apocalyptic number.

21628214743 is a deficient number, since it is larger than the sum of its proper divisors (7392137).

21628214743 is an equidigital number, since it uses as much as digits as its factorization.

21628214743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392136.

The product of its digits is 129024, while the sum is 40.

The spelling of 21628214743 in words is "twenty-one billion, six hundred twenty-eight million, two hundred fourteen thousand, seven hundred forty-three".