221722691689 has 8 divisors (see below), whose sum is σ = 231416046792. Its totient is φ = 212233407360.

The previous prime is 221722691677. The next prime is 221722691717. The reversal of 221722691689 is 986196227122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1123389289 + 220599302400 = 33517^2 + 469680^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221722691689 is a prime.

It is a super-3 number, since 3×221722691689³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221722691629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51015474 + ... + 51019819.

It is an arithmetic number, because the mean of its divisors is an integer number (28927005849).

Almost surely, 2^221722691689 is an apocalyptic number.

It is an amenable number.

221722691689 is a deficient number, since it is larger than the sum of its proper divisors (9693355103).

221722691689 is a wasteful number, since it uses less digits than its factorization.

221722691689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102035387.

The product of its digits is 2612736, while the sum is 55.

The spelling of 221722691689 in words is "two hundred twenty-one billion, seven hundred twenty-two million, six hundred ninety-one thousand, six hundred eighty-nine".