7472221 has 2 divisors, whose sum is σ = 7472222. Its totient is φ = 7472220.

The previous prime is 7472191. The next prime is 7472237. The reversal of 7472221 is 1222747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7452900 + 19321 = 2730^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 7472221 - 2⁵ = 7472189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7472321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3736110 + 3736111.

It is an arithmetic number, because the mean of its divisors is an integer number (3736111).

Almost surely, 2^7472221 is an apocalyptic number.

It is an amenable number.

7472221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7472221 is an equidigital number, since it uses as much as digits as its factorization.

7472221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 25.

The square root of 7472221 is about 2733.5363542488. The cubic root of 7472221 is about 195.5014139435.

Adding to 7472221 its reverse (1222747), we get a palindrome (8694968).

The spelling of 7472221 in words is "seven million, four hundred seventy-two thousand, two hundred twenty-one".