7121222021 has 8 divisors (see below), whose sum is σ = 7936966080. Its totient is φ = 6349572288.

The previous prime is 7121222011. The next prime is 7121222023. The reversal of 7121222021 is 1202221217.

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 7121222021 - 2¹⁸ = 7120959877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7121221984 and 7121222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121222023) 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, 11023241 + ... + 11023886.

It is an arithmetic number, because the mean of its divisors is an integer number (992120760).

Almost surely, 2^7121222021 is an apocalyptic number.

It is an amenable number.

7121222021 is a deficient number, since it is larger than the sum of its proper divisors (815744059).

7121222021 is a wasteful number, since it uses less digits than its factorization.

7121222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22047163.

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

The square root of 7121222021 is about 84387.3332971246. Note that the first 3 decimals coincide. The cubic root of 7121222021 is about 1923.9103989239.

Adding to 7121222021 its reverse (1202221217), we get a palindrome (8323443238).

The spelling of 7121222021 in words is "seven billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".