21140123433 has 16 divisors (see below), whose sum is σ = 33114599616. Its totient is φ = 11826642240.

The previous prime is 21140123401. The next prime is 21140123437. The reversal of 21140123433 is 33432104112.

It is a happy number.

It is not a de Polignac number, because 21140123433 - 2⁵ = 21140123401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21140123437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24638410 + ... + 24639267.

It is an arithmetic number, because the mean of its divisors is an integer number (2069662476).

Almost surely, 2^21140123433 is an apocalyptic number.

It is an amenable number.

21140123433 is a deficient number, since it is larger than the sum of its proper divisors (11974476183).

21140123433 is a wasteful number, since it uses less digits than its factorization.

21140123433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49277704.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21140123433 its reverse (33432104112), we get a palindrome (54572227545).

The spelling of 21140123433 in words is "twenty-one billion, one hundred forty million, one hundred twenty-three thousand, four hundred thirty-three".