4165622921 has 2 divisors, whose sum is σ = 4165622922. Its totient is φ = 4165622920.

The previous prime is 4165622819. The next prime is 4165622939. The reversal of 4165622921 is 1292265614.

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., 2496001600 + 1669621321 = 49960^2 + 40861^2 .

It is a cyclic number.

It is not a de Polignac number, because 4165622921 - 2¹⁴ = 4165606537 is a prime.

It is not a weakly prime, because it can be changed into another prime (4165628921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082811460 + 2082811461.

It is an arithmetic number, because the mean of its divisors is an integer number (2082811461).

Almost surely, 2^4165622921 is an apocalyptic number.

It is an amenable number.

4165622921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4165622921 is an equidigital number, since it uses as much as digits as its factorization.

4165622921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 4165622921 is about 64541.6371112478. The cubic root of 4165622921 is about 1609.0145997403.

The spelling of 4165622921 in words is "four billion, one hundred sixty-five million, six hundred twenty-two thousand, nine hundred twenty-one".