1721427120 has 320 divisors, whose sum is σ = 6818135040. Its totient is φ = 391053312.

The previous prime is 1721427119. The next prime is 1721427139. The reversal of 1721427120 is 217241271.

It is a happy number.

It is a super-2 number, since 2×1721427120² = 5926622658942988800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3885619 + ... + 3886061.

It is an arithmetic number, because the mean of its divisors is an integer number (21306672).

Almost surely, 2^1721427120 is an apocalyptic number.

1721427120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721427120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3409067520).

1721427120 is an abundant number, since it is smaller than the sum of its proper divisors (5096707920).

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

1721427120 is a wasteful number, since it uses less digits than its factorization.

1721427120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1721427120 is about 41490.0845986122. The cubic root of 1721427120 is about 1198.4765667778.

Adding to 1721427120 its reverse (217241271), we get a palindrome (1938668391).

The spelling of 1721427120 in words is "one billion, seven hundred twenty-one million, four hundred twenty-seven thousand, one hundred twenty".