1721001222 has 32 divisors (see below), whose sum is σ = 4049416800. Its totient is φ = 539921664.

The previous prime is 1721001211. The next prime is 1721001229. The reversal of 1721001222 is 2221001271.

It is a happy number.

It is a super-2 number, since 2×1721001222² = 5923690412250986568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1721001195 and 1721001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721001229) 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 15 ways as a sum of consecutive naturals, for example, 936447 + ... + 938282.

It is an arithmetic number, because the mean of its divisors is an integer number (126544275).

Almost surely, 2^1721001222 is an apocalyptic number.

1721001222 is an abundant number, since it is smaller than the sum of its proper divisors (2328415578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721001222 is a wasteful number, since it uses less digits than its factorization.

1721001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874757 (or 1874751 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1721001222 is about 41484.9517536178. The cubic root of 1721001222 is about 1198.3777203289.

Adding to 1721001222 its reverse (2221001271), we get a palindrome (3942002493).

The spelling of 1721001222 in words is "one billion, seven hundred twenty-one million, one thousand, two hundred twenty-two".