21400021233 has 48 divisors (see below), whose sum is σ = 33839769600. Its totient is φ = 13477110480.

The previous prime is 21400021231. The next prime is 21400021267. The reversal of 21400021233 is 33212000412.

21400021233 is a `hidden beast` number, since 21 + 400 + 0 + 212 + 33 = 666.

It is not a de Polignac number, because 21400021233 - 2¹ = 21400021231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21400021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1651048 + ... + 1663958.

It is an arithmetic number, because the mean of its divisors is an integer number (704995200).

Almost surely, 2^21400021233 is an apocalyptic number.

It is an amenable number.

21400021233 is a deficient number, since it is larger than the sum of its proper divisors (12439748367).

21400021233 is a wasteful number, since it uses less digits than its factorization.

21400021233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304 (or 13292 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21400021233 its reverse (33212000412), we get a palindrome (54612021645).

The spelling of 21400021233 in words is "twenty-one billion, four hundred million, twenty-one thousand, two hundred thirty-three".