721003212612 has 36 divisors (see below), whose sum is σ = 1826489380716. Its totient is φ = 239813065920.

The previous prime is 721003212583. The next prime is 721003212647. The reversal of 721003212612 is 216212300127.

721003212612 is a `hidden beast` number, since 7 + 2 + 1 + 0 + 0 + 32 + 12 + 612 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 165823241796 + 555179970816 = 407214^2 + 745104^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21705603 + ... + 21738794.

It is an arithmetic number, because the mean of its divisors is an integer number (50735816131).

Almost surely, 2^721003212612 is an apocalyptic number.

It is an amenable number.

721003212612 is an abundant number, since it is smaller than the sum of its proper divisors (1105486168104).

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

721003212612 is a wasteful number, since it uses less digits than its factorization.

721003212612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43444868 (or 43444863 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 721003212612 its reverse (216212300127), we get a palindrome (937215512739).

The spelling of 721003212612 in words is "seven hundred twenty-one billion, three million, two hundred twelve thousand, six hundred twelve".