233213421 has 16 divisors (see below), whose sum is σ = 356646528. Its totient is φ = 132787200.

The previous prime is 233213419. The next prime is 233213423. The reversal of 233213421 is 124312332.

It is an interprime number because it is at equal distance from previous prime (233213419) and next prime (233213423).

It is not a de Polignac number, because 233213421 - 2¹ = 233213419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233213423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13860 + ... + 25661.

It is an arithmetic number, because the mean of its divisors is an integer number (22290408).

Almost surely, 2^233213421 is an apocalyptic number.

233213421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

233213421 is a deficient number, since it is larger than the sum of its proper divisors (123433107).

233213421 is a wasteful number, since it uses less digits than its factorization.

233213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39812.

The product of its digits is 864, while the sum is 21.

The square root of 233213421 is about 15271.3267596499. The cubic root of 233213421 is about 615.5327711939.

Adding to 233213421 its reverse (124312332), we get a palindrome (357525753).

It can be divided in two parts, 2332 and 13421, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 233213421 in words is "two hundred thirty-three million, two hundred thirteen thousand, four hundred twenty-one".