7220438283521 has 8 divisors (see below), whose sum is σ = 7262249800680. Its totient is φ = 7178627627392.

The previous prime is 7220438283481. The next prime is 7220438283533. The reversal of 7220438283521 is 1253828340227.

7220438283521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1577438033521 + 5643000250000 = 1255961^2 + 2375500^2 .

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 7220438283521 - 2²² = 7220434089217 is a prime.

It is a super-2 number, since 2×7220438283521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7220438283551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25398461 + ... + 25681173.

It is an arithmetic number, because the mean of its divisors is an integer number (907781225085).

Almost surely, 2^{7220438283521} is an apocalyptic number.

It is an amenable number.

7220438283521 is a deficient number, since it is larger than the sum of its proper divisors (41811517159).

7220438283521 is a wasteful number, since it uses less digits than its factorization.

7220438283521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430515.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 7220438283521 in words is "seven trillion, two hundred twenty billion, four hundred thirty-eight million, two hundred eighty-three thousand, five hundred twenty-one".