235140021 has 6 divisors (see below), whose sum is σ = 339646710. Its totient is φ = 156760008.

The previous prime is 235140011. The next prime is 235140049. The reversal of 235140021 is 120041532.

It can be written as a sum of positive squares in only one way, i.e., 140778225 + 94361796 = 11865^2 + 9714^2 .

It is not a de Polignac number, because 235140021 - 2⁷ = 235139893 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 235139976 and 235140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235140011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13063326 + ... + 13063343.

It is an arithmetic number, because the mean of its divisors is an integer number (56607785).

Almost surely, 2^235140021 is an apocalyptic number.

It is an amenable number.

235140021 is a deficient number, since it is larger than the sum of its proper divisors (104506689).

235140021 is a wasteful number, since it uses less digits than its factorization.

235140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26126675 (or 26126672 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 235140021 is about 15334.2760181236. The cubic root of 235140021 is about 617.2231181209.

Adding to 235140021 its reverse (120041532), we get a palindrome (355181553).

The spelling of 235140021 in words is "two hundred thirty-five million, one hundred forty thousand, twenty-one".