7212249721 has 8 divisors (see below), whose sum is σ = 7312322304. Its totient is φ = 7112782320.

The previous prime is 7212249701. The next prime is 7212249731. The reversal of 7212249721 is 1279422127.

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

It is a cyclic number.

It is not a de Polignac number, because 7212249721 - 2¹³ = 7212241529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7212249701) 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, 127270 + ... + 174991.

It is an arithmetic number, because the mean of its divisors is an integer number (914040288).

Almost surely, 2^7212249721 is an apocalyptic number.

It is an amenable number.

7212249721 is a deficient number, since it is larger than the sum of its proper divisors (100072583).

7212249721 is a wasteful number, since it uses less digits than its factorization.

7212249721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302591.

The product of its digits is 28224, while the sum is 37.

The square root of 7212249721 is about 84924.9652399105. The cubic root of 7212249721 is about 1932.0732390860.

The spelling of 7212249721 in words is "seven billion, two hundred twelve million, two hundred forty-nine thousand, seven hundred twenty-one".