235813221 has 24 divisors (see below), whose sum is σ = 399618240. Its totient is φ = 134629776.

The previous prime is 235813217. The next prime is 235813229. The reversal of 235813221 is 122318532.

235813221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 235813221 - 2² = 235813217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235813229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210555 + ... + 211671.

It is an arithmetic number, because the mean of its divisors is an integer number (16650760).

Almost surely, 2^235813221 is an apocalyptic number.

235813221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

235813221 is a deficient number, since it is larger than the sum of its proper divisors (163805019).

235813221 is an frugal number, since it uses more digits than its factorization.

235813221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250 (or 1127 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 235813221 is about 15356.2111537970. The cubic root of 235813221 is about 617.8115883366.

The spelling of 235813221 in words is "two hundred thirty-five million, eight hundred thirteen thousand, two hundred twenty-one".