4156388221 has 2 divisors, whose sum is σ = 4156388222. Its totient is φ = 4156388220.

The previous prime is 4156388219. The next prime is 4156388233. The reversal of 4156388221 is 1228836514.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2861180100 + 1295208121 = 53490^2 + 35989^2 .

It is a cyclic number.

It is not a de Polignac number, because 4156388221 - 2¹ = 4156388219 is a prime.

Together with 4156388219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4156388321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078194110 + 2078194111.

It is an arithmetic number, because the mean of its divisors is an integer number (2078194111).

Almost surely, 2^4156388221 is an apocalyptic number.

It is an amenable number.

4156388221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4156388221 is an equidigital number, since it uses as much as digits as its factorization.

4156388221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 4156388221 is about 64470.0567783215. The cubic root of 4156388221 is about 1607.8247208194.

The spelling of 4156388221 in words is "four billion, one hundred fifty-six million, three hundred eighty-eight thousand, two hundred twenty-one".