21053133423 has 48 divisors (see below), whose sum is σ = 35621554176. Its totient is φ = 11732031360.

The previous prime is 21053133401. The next prime is 21053133463. The reversal of 21053133423 is 32433135012.

21053133423 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 313 + 342 + 3 = 666.

It is not a de Polignac number, because 21053133423 - 2²⁰ = 21052084847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053133463) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 819390 + ... + 844692.

It is an arithmetic number, because the mean of its divisors is an integer number (742115712).

Almost surely, 2^21053133423 is an apocalyptic number.

21053133423 is a deficient number, since it is larger than the sum of its proper divisors (14568420753).

21053133423 is a wasteful number, since it uses less digits than its factorization.

21053133423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25644 (or 25641 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21053133423 its reverse (32433135012), we get a palindrome (53486268435).

The spelling of 21053133423 in words is "twenty-one billion, fifty-three million, one hundred thirty-three thousand, four hundred twenty-three".