721206051 has 8 divisors (see below), whose sum is σ = 967508160. Its totient is φ = 477853992.

The previous prime is 721206043. The next prime is 721206053. The reversal of 721206051 is 150602127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721206051 - 2³ = 721206043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721206053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736941 + ... + 737918.

It is an arithmetic number, because the mean of its divisors is an integer number (120938520).

Almost surely, 2^721206051 is an apocalyptic number.

721206051 is a deficient number, since it is larger than the sum of its proper divisors (246302109).

721206051 is a wasteful number, since it uses less digits than its factorization.

721206051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475025.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 721206051 is about 26855.2797602259. The cubic root of 721206051 is about 896.7811148366.

Adding to 721206051 its reverse (150602127), we get a palindrome (871808178).

The spelling of 721206051 in words is "seven hundred twenty-one million, two hundred six thousand, fifty-one".