4221771649 has 4 divisors (see below), whose sum is σ = 4221913264. Its totient is φ = 4221630036.

The previous prime is 4221771641. The next prime is 4221771679. The reversal of 4221771649 is 9461771224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4221771649 - 2³ = 4221771641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221771641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6807 + ... + 92140.

It is an arithmetic number, because the mean of its divisors is an integer number (1055478316).

Almost surely, 2^4221771649 is an apocalyptic number.

It is an amenable number.

4221771649 is a deficient number, since it is larger than the sum of its proper divisors (141615).

4221771649 is an equidigital number, since it uses as much as digits as its factorization.

4221771649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141614.

The product of its digits is 169344, while the sum is 43.

The square root of 4221771649 is about 64975.1617851006. The cubic root of 4221771649 is about 1616.2117000016.

The spelling of 4221771649 in words is "four billion, two hundred twenty-one million, seven hundred seventy-one thousand, six hundred forty-nine".