21230133021 has 16 divisors (see below), whose sum is σ = 31458045120. Its totient is φ = 14150723760.

The previous prime is 21230133011. The next prime is 21230133053. The reversal of 21230133021 is 12033103212.

21230133021 is a `hidden beast` number, since 2 + 12 + 301 + 330 + 21 = 666.

It is not a de Polignac number, because 21230133021 - 2⁷ = 21230132893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230132985 and 21230133003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230133011) 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 15 ways as a sum of consecutive naturals, for example, 74731 + ... + 219191.

It is an arithmetic number, because the mean of its divisors is an integer number (1966127820).

Almost surely, 2^21230133021 is an apocalyptic number.

It is an amenable number.

21230133021 is a deficient number, since it is larger than the sum of its proper divisors (10227912099).

21230133021 is a wasteful number, since it uses less digits than its factorization.

21230133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149913 (or 149907 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21230133021 its reverse (12033103212), we get a palindrome (33263236233).

The spelling of 21230133021 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-three thousand, twenty-one".