43021157 has 2 divisors, whose sum is σ = 43021158. Its totient is φ = 43021156.

The previous prime is 43021133. The next prime is 43021159. The reversal of 43021157 is 75112034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43020481 + 676 = 6559^2 + 26^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43021157 is a prime.

Together with 43021159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43021159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21510578 + 21510579.

It is an arithmetic number, because the mean of its divisors is an integer number (21510579).

Almost surely, 2^43021157 is an apocalyptic number.

It is an amenable number.

43021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021157 is an equidigital number, since it uses as much as digits as its factorization.

43021157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 43021157 is about 6559.0515320433. The cubic root of 43021157 is about 350.3972550616.

The spelling of 43021157 in words is "forty-three million, twenty-one thousand, one hundred fifty-seven".