721385212 has 12 divisors (see below), whose sum is σ = 1283821560. Its totient is φ = 354579056.

The previous prime is 721385183. The next prime is 721385213. The reversal of 721385212 is 212583127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721385213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528123 + ... + 1528594.

It is an arithmetic number, because the mean of its divisors is an integer number (106985130).

Almost surely, 2^721385212 is an apocalyptic number.

It is an amenable number.

721385212 is a deficient number, since it is larger than the sum of its proper divisors (562436348).

721385212 is a wasteful number, since it uses less digits than its factorization.

721385212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056780 (or 3056778 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 721385212 is about 26858.6152286375. The cubic root of 721385212 is about 896.8553677258.

The spelling of 721385212 in words is "seven hundred twenty-one million, three hundred eighty-five thousand, two hundred twelve".