721251213 has 8 divisors (see below), whose sum is σ = 985123776. Its totient is φ = 469106400.

The previous prime is 721251211. The next prime is 721251233. The reversal of 721251213 is 312152127.

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

It is not a de Polignac number, because 721251213 - 2¹ = 721251211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721251211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2931793 + ... + 2932038.

It is an arithmetic number, because the mean of its divisors is an integer number (123140472).

Almost surely, 2^721251213 is an apocalyptic number.

It is an amenable number.

721251213 is a deficient number, since it is larger than the sum of its proper divisors (263872563).

721251213 is a wasteful number, since it uses less digits than its factorization.

721251213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863875.

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

The square root of 721251213 is about 26856.1205873075. The cubic root of 721251213 is about 896.7998332890.

The spelling of 721251213 in words is "seven hundred twenty-one million, two hundred fifty-one thousand, two hundred thirteen".