7221247746021 has 20 divisors (see below), whose sum is σ = 10787980797132. Its totient is φ = 4813859559168.

The previous prime is 7221247746001. The next prime is 7221247746059. The reversal of 7221247746021 is 1206477421227.

7221247746021 is a `hidden beast` number, since 7 + 22 + 12 + 4 + 7 + 7 + 4 + 602 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1850650068996 + 5370597677025 = 1360386^2 + 2317455^2 .

It is not a de Polignac number, because 7221247746021 - 2⁷ = 7221247745893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221247746001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1542220 + ... + 4101333.

Almost surely, 2^{7221247746021} is an apocalyptic number.

It is an amenable number.

7221247746021 is a deficient number, since it is larger than the sum of its proper divisors (3566733051111).

7221247746021 is a wasteful number, since it uses less digits than its factorization.

7221247746021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5659362 (or 5659353 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 45.

The spelling of 7221247746021 in words is "seven trillion, two hundred twenty-one billion, two hundred forty-seven million, seven hundred forty-six thousand, twenty-one".