42721183 has 2 divisors, whose sum is σ = 42721184. Its totient is φ = 42721182.

The previous prime is 42721181. The next prime is 42721201. The reversal of 42721183 is 38112724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42721183 - 2¹ = 42721181 is a prime.

Together with 42721181, 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 (42721181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21360591 + 21360592.

It is an arithmetic number, because the mean of its divisors is an integer number (21360592).

Almost surely, 2^42721183 is an apocalyptic number.

42721183 is a deficient number, since it is larger than the sum of its proper divisors (1).

42721183 is an equidigital number, since it uses as much as digits as its factorization.

42721183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 42721183 is about 6536.1443527511. The cubic root of 42721183 is about 349.5809488150.

The spelling of 42721183 in words is "forty-two million, seven hundred twenty-one thousand, one hundred eighty-three".