7222213421 has 2 divisors, whose sum is σ = 7222213422. Its totient is φ = 7222213420.

The previous prime is 7222213403. The next prime is 7222213457. The reversal of 7222213421 is 1243122227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6644532196 + 577681225 = 81514^2 + 24035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7222213421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7222213021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3611106710 + 3611106711.

It is an arithmetic number, because the mean of its divisors is an integer number (3611106711).

Almost surely, 2^7222213421 is an apocalyptic number.

It is an amenable number.

7222213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7222213421 is an equidigital number, since it uses as much as digits as its factorization.

7222213421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 7222213421 is about 84983.6067780134. The cubic root of 7222213421 is about 1932.9625473598.

Adding to 7222213421 its reverse (1243122227), we get a palindrome (8465335648).

The spelling of 7222213421 in words is "seven billion, two hundred twenty-two million, two hundred thirteen thousand, four hundred twenty-one".