21412133021 has 2 divisors, whose sum is σ = 21412133022. Its totient is φ = 21412133020.

The previous prime is 21412133009. The next prime is 21412133077. The reversal of 21412133021 is 12033121412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13529179225 + 7882953796 = 116315^2 + 88786^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412133021 - 2¹⁰ = 21412131997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21412132984 and 21412133002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21412130021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706066510 + 10706066511.

It is an arithmetic number, because the mean of its divisors is an integer number (10706066511).

Almost surely, 2^21412133021 is an apocalyptic number.

It is an amenable number.

21412133021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412133021 is an equidigital number, since it uses as much as digits as its factorization.

21412133021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21412133021 its reverse (12033121412), we get a palindrome (33445254433).

The spelling of 21412133021 in words is "twenty-one billion, four hundred twelve million, one hundred thirty-three thousand, twenty-one".