21010234233 has 4 divisors (see below), whose sum is σ = 28013645648. Its totient is φ = 14006822820.

The previous prime is 21010234187. The next prime is 21010234279. The reversal of 21010234233 is 33243201012.

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 an interprime number because it is at equal distance from previous prime (21010234187) and next prime (21010234279).

It is not a de Polignac number, because 21010234233 - 2⁶ = 21010234169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010234433) 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, 3501705703 + ... + 3501705708.

It is an arithmetic number, because the mean of its divisors is an integer number (7003411412).

Almost surely, 2^21010234233 is an apocalyptic number.

It is an amenable number.

21010234233 is a deficient number, since it is larger than the sum of its proper divisors (7003411415).

21010234233 is an equidigital number, since it uses as much as digits as its factorization.

21010234233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003411414.

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

Adding to 21010234233 its reverse (33243201012), we get a palindrome (54253435245).

The spelling of 21010234233 in words is "twenty-one billion, ten million, two hundred thirty-four thousand, two hundred thirty-three".