721401120 has 768 divisors, whose sum is σ = 3135283200. Its totient is φ = 152616960.

The previous prime is 721401047. The next prime is 721401133. The reversal of 721401120 is 21104127.

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 = 721401093 and 721401102.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 15348937 + ... + 15348983.

It is an arithmetic number, because the mean of its divisors is an integer number (4082400).

Almost surely, 2^721401120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721401120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1567641600).

721401120 is an abundant number, since it is smaller than the sum of its proper divisors (2413882080).

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

721401120 is a wasteful number, since it uses less digits than its factorization.

721401120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 104 counting only the distinct ones).

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

The square root of 721401120 is about 26858.9113703441. The cubic root of 721401120 is about 896.8619601677.

Adding to 721401120 its reverse (21104127), we get a palindrome (742505247).

The spelling of 721401120 in words is "seven hundred twenty-one million, four hundred one thousand, one hundred twenty".