1722240000021 has 8 divisors (see below), whose sum is σ = 2296419187360. Its totient is φ = 1148110406352.

The previous prime is 1722239999993. The next prime is 1722240000029. The reversal of 1722240000021 is 1200000422271.

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

It is not a de Polignac number, because 1722240000021 - 2²³ = 1722231611413 is a prime.

It is a super-2 number, since 2×1722240000021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722240000029) 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 7 ways as a sum of consecutive naturals, for example, 12317311 + ... + 12456348.

It is an arithmetic number, because the mean of its divisors is an integer number (287052398420).

Almost surely, 2^{1722240000021} is an apocalyptic number.

It is an amenable number.

1722240000021 is a deficient number, since it is larger than the sum of its proper divisors (574179187339).

1722240000021 is a wasteful number, since it uses less digits than its factorization.

1722240000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24796835.

The product of its (nonzero) digits is 448, while the sum is 21.

Adding to 1722240000021 its reverse (1200000422271), we get a palindrome (2922240422292).

The spelling of 1722240000021 in words is "one trillion, seven hundred twenty-two billion, two hundred forty million, twenty-one", and thus it is an aban number.