15452221 has 2 divisors, whose sum is σ = 15452222. Its totient is φ = 15452220.

The previous prime is 15452219. The next prime is 15452243. The reversal of 15452221 is 12225451.

It is an a-pointer prime, because the next prime (15452243) can be obtained adding 15452221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9272025 + 6180196 = 3045^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 15452221 - 2¹ = 15452219 is a prime.

It is a super-2 number, since 2×15452221² = 477542267665682, which contains 22 as substring.

Together with 15452219, 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 = 15452192 and 15452201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15450221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7726110 + 7726111.

It is an arithmetic number, because the mean of its divisors is an integer number (7726111).

Almost surely, 2^15452221 is an apocalyptic number.

It is an amenable number.

15452221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15452221 is an equidigital number, since it uses as much as digits as its factorization.

15452221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 22.

The square root of 15452221 is about 3930.9313145869. The cubic root of 15452221 is about 249.0750944185.

Adding to 15452221 its reverse (12225451), we get a palindrome (27677672).

The spelling of 15452221 in words is "fifteen million, four hundred fifty-two thousand, two hundred twenty-one".