221706620743 has 4 divisors (see below), whose sum is σ = 222490036648. Its totient is φ = 220923204840.

The previous prime is 221706620719. The next prime is 221706620797. The reversal of 221706620743 is 347026607122.

It is a happy number.

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 221706620743 - 2²⁵ = 221673066311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221706620696 and 221706620705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221706620243) 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, 391707528 + ... + 391708093.

It is an arithmetic number, because the mean of its divisors is an integer number (55622509162).

Almost surely, 2^221706620743 is an apocalyptic number.

221706620743 is a deficient number, since it is larger than the sum of its proper divisors (783415905).

221706620743 is an equidigital number, since it uses as much as digits as its factorization.

221706620743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783415904.

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 221706620743 in words is "two hundred twenty-one billion, seven hundred six million, six hundred twenty thousand, seven hundred forty-three".