235742021 has 4 divisors (see below), whose sum is σ = 235788000. Its totient is φ = 235696044.

The previous prime is 235741999. The next prime is 235742027. The reversal of 235742021 is 120247532.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-235742021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235742027) 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, 14171 + ... + 25928.

It is an arithmetic number, because the mean of its divisors is an integer number (58947000).

Almost surely, 2^235742021 is an apocalyptic number.

It is an amenable number.

235742021 is a deficient number, since it is larger than the sum of its proper divisors (45979).

235742021 is an equidigital number, since it uses as much as digits as its factorization.

235742021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45978.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 235742021 is about 15353.8926985960. The cubic root of 235742021 is about 617.7494026616.

Adding to 235742021 its reverse (120247532), we get a palindrome (355989553).

The spelling of 235742021 in words is "two hundred thirty-five million, seven hundred forty-two thousand, twenty-one".