234331400021 has 4 divisors (see below), whose sum is σ = 238172898444. Its totient is φ = 230489901600.

The previous prime is 234331399993. The next prime is 234331400047. The reversal of 234331400021 is 120004133432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5589207121 + 228742192900 = 74761^2 + 478270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234331400021 is a prime.

It is a super-2 number, since 2×234331400021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 234331400021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234331400521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920749120 + ... + 1920749241.

It is an arithmetic number, because the mean of its divisors is an integer number (59543224611).

Almost surely, 2^234331400021 is an apocalyptic number.

It is an amenable number.

234331400021 is a deficient number, since it is larger than the sum of its proper divisors (3841498423).

234331400021 is an equidigital number, since it uses as much as digits as its factorization.

234331400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841498422.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 234331400021 its reverse (120004133432), we get a palindrome (354335533453).

The spelling of 234331400021 in words is "two hundred thirty-four billion, three hundred thirty-one million, four hundred thousand, twenty-one".