7213405235221 has 4 divisors (see below), whose sum is σ = 7637723190252. Its totient is φ = 6789087280192.

The previous prime is 7213405235219. The next prime is 7213405235233. The reversal of 7213405235221 is 1225325043127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4798023012721 + 2415382222500 = 2190439^2 + 1554150^2 .

It is a cyclic number.

It is not a de Polignac number, because 7213405235221 - 2¹ = 7213405235219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7213403235221) 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 3 ways as a sum of consecutive naturals, for example, 212158977490 + ... + 212158977523.

It is an arithmetic number, because the mean of its divisors is an integer number (1909430797563).

Almost surely, 2^{7213405235221} is an apocalyptic number.

It is an amenable number.

7213405235221 is a deficient number, since it is larger than the sum of its proper divisors (424317955031).

7213405235221 is a wasteful number, since it uses less digits than its factorization.

7213405235221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424317955030.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 7213405235221 in words is "seven trillion, two hundred thirteen billion, four hundred five million, two hundred thirty-five thousand, two hundred twenty-one".