4187564221 has 2 divisors, whose sum is σ = 4187564222. Its totient is φ = 4187564220.

The previous prime is 4187564177. The next prime is 4187564237. The reversal of 4187564221 is 1224657814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4074907225 + 112656996 = 63835^2 + 10614^2 .

It is a cyclic number.

It is not a de Polignac number, because 4187564221 - 2¹³ = 4187556029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4187564921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2093782110 + 2093782111.

It is an arithmetic number, because the mean of its divisors is an integer number (2093782111).

Almost surely, 2^4187564221 is an apocalyptic number.

It is an amenable number.

4187564221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4187564221 is an equidigital number, since it uses as much as digits as its factorization.

4187564221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 40.

The square root of 4187564221 is about 64711.3917405583. The cubic root of 4187564221 is about 1611.8346716238.

The spelling of 4187564221 in words is "four billion, one hundred eighty-seven million, five hundred sixty-four thousand, two hundred twenty-one".