7223021021 has 2 divisors, whose sum is σ = 7223021022. Its totient is φ = 7223021020.

The previous prime is 7223021017. The next prime is 7223021023. The reversal of 7223021021 is 1201203227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4731513796 + 2491507225 = 68786^2 + 49915^2 .

It is a cyclic number.

It is not a de Polignac number, because 7223021021 - 2² = 7223021017 is a prime.

Together with 7223021023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7223020984 and 7223021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7223021023) 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 as a sum of consecutive naturals, namely, 3611510510 + 3611510511.

It is an arithmetic number, because the mean of its divisors is an integer number (3611510511).

Almost surely, 2^7223021021 is an apocalyptic number.

It is an amenable number.

7223021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7223021021 is an equidigital number, since it uses as much as digits as its factorization.

7223021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 7223021021 is about 84988.3581498078. The cubic root of 7223021021 is about 1933.0345937108.

Adding to 7223021021 its reverse (1201203227), we get a palindrome (8424224248).

The spelling of 7223021021 in words is "seven billion, two hundred twenty-three million, twenty-one thousand, twenty-one".