7211240021 has 8 divisors (see below), whose sum is σ = 7460883000. Its totient is φ = 6961662400.

The previous prime is 7211239969. The next prime is 7211240039. The reversal of 7211240021 is 1200421127.

It can be written as a sum of positive squares in 4 ways, for example, as 5793340996 + 1417899025 = 76114^2 + 37655^2 .

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 7211240021 - 2¹⁴ = 7211223637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7211239975 and 7211240002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7211240321) 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, 340655 + ... + 361203.

It is an arithmetic number, because the mean of its divisors is an integer number (932610375).

Almost surely, 2^7211240021 is an apocalyptic number.

It is an amenable number.

7211240021 is a deficient number, since it is larger than the sum of its proper divisors (249642979).

7211240021 is a wasteful number, since it uses less digits than its factorization.

7211240021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32679.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 7211240021 is about 84919.0203723524. The cubic root of 7211240021 is about 1931.9830727963.

Adding to 7211240021 its reverse (1200421127), we get a palindrome (8411661148).

The spelling of 7211240021 in words is "seven billion, two hundred eleven million, two hundred forty thousand, twenty-one".