2415542221 has 2 divisors, whose sum is σ = 2415542222. Its totient is φ = 2415542220.

The previous prime is 2415542177. The next prime is 2415542263. The reversal of 2415542221 is 1222455142.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1628122500 + 787419721 = 40350^2 + 28061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2415542221 - 2¹⁷ = 2415411149 is a prime.

It is a super-2 number, since 2×2415542221² = 11669688442867225682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2415542221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2415542321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1207771110 + 1207771111.

It is an arithmetic number, because the mean of its divisors is an integer number (1207771111).

Almost surely, 2^2415542221 is an apocalyptic number.

It is an amenable number.

2415542221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2415542221 is an equidigital number, since it uses as much as digits as its factorization.

2415542221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 28.

The square root of 2415542221 is about 49148.1659983361. The cubic root of 2415542221 is about 1341.7498156579.

Adding to 2415542221 its reverse (1222455142), we get a palindrome (3637997363).

The spelling of 2415542221 in words is "two billion, four hundred fifteen million, five hundred forty-two thousand, two hundred twenty-one".