2215445521 has 2 divisors, whose sum is σ = 2215445522. Its totient is φ = 2215445520.

The previous prime is 2215445503. The next prime is 2215445539. The reversal of 2215445521 is 1255445122.

It is a balanced prime because it is at equal distance from previous prime (2215445503) and next prime (2215445539).

It can be written as a sum of positive squares in only one way, i.e., 2205617296 + 9828225 = 46964^2 + 3135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215445521 - 2⁵ = 2215445489 is a prime.

It is a super-2 number, since 2×2215445521² = 9816397713037922882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2215445501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107722760 + 1107722761.

It is an arithmetic number, because the mean of its divisors is an integer number (1107722761).

Almost surely, 2^2215445521 is an apocalyptic number.

It is an amenable number.

2215445521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215445521 is an equidigital number, since it uses as much as digits as its factorization.

2215445521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16000, while the sum is 31.

The square root of 2215445521 is about 47068.5194264702. The cubic root of 2215445521 is about 1303.6280352957.

The spelling of 2215445521 in words is "two billion, two hundred fifteen million, four hundred forty-five thousand, five hundred twenty-one".