1722106021 has 8 divisors (see below), whose sum is σ = 1813152800. Its totient is φ = 1631100240.

The previous prime is 1722106013. The next prime is 1722106031. The reversal of 1722106021 is 1206012271.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1722106021 - 2³ = 1722106013 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 1722105983 and 1722106001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722106031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115906 + ... + 129916.

It is an arithmetic number, because the mean of its divisors is an integer number (226644100).

Almost surely, 2^1722106021 is an apocalyptic number.

It is an amenable number.

1722106021 is a deficient number, since it is larger than the sum of its proper divisors (91046779).

1722106021 is a wasteful number, since it uses less digits than its factorization.

1722106021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20499.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1722106021 is about 41498.2652769968. The cubic root of 1722106021 is about 1198.6340988609.

Adding to 1722106021 its reverse (1206012271), we get a palindrome (2928118292).

The spelling of 1722106021 in words is "one billion, seven hundred twenty-two million, one hundred six thousand, twenty-one".