721107222 has 16 divisors (see below), whose sum is σ = 1573324992. Its totient is φ = 218517320.

The previous prime is 721107217. The next prime is 721107253. The reversal of 721107222 is 222701127.

It is a junction number, because it is equal to n+sod(n) for n = 721107192 and 721107201.

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 7 ways as a sum of consecutive naturals, for example, 5462868 + ... + 5462999.

It is an arithmetic number, because the mean of its divisors is an integer number (98332812).

Almost surely, 2^721107222 is an apocalyptic number.

721107222 is an abundant number, since it is smaller than the sum of its proper divisors (852217770).

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

721107222 is a wasteful number, since it uses less digits than its factorization.

721107222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10925883.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 721107222 is about 26853.4396679457. The cubic root of 721107222 is about 896.7401501085.

Adding to 721107222 its reverse (222701127), we get a palindrome (943808349).

The spelling of 721107222 in words is "seven hundred twenty-one million, one hundred seven thousand, two hundred twenty-two".