721012842 has 48 divisors (see below), whose sum is σ = 1710408960. Its totient is φ = 217694400.

The previous prime is 721012793. The next prime is 721012847. The reversal of 721012842 is 248210127.

It is not an unprimeable number, because it can be changed into a prime (721012847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49159 + ... + 62117.

It is an arithmetic number, because the mean of its divisors is an integer number (35633520).

Almost surely, 2^721012842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721012842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855204480).

721012842 is an abundant number, since it is smaller than the sum of its proper divisors (989396118).

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

721012842 is a wasteful number, since it uses less digits than its factorization.

721012842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13259 (or 13256 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 721012842 is about 26851.6822936664. The cubic root of 721012842 is about 896.7010260016.

Adding to 721012842 its reverse (248210127), we get a palindrome (969222969).

The spelling of 721012842 in words is "seven hundred twenty-one million, twelve thousand, eight hundred forty-two".