21324430413 has 40 divisors (see below), whose sum is σ = 37424091936. Its totient is φ = 11929744800.

The previous prime is 21324430373. The next prime is 21324430429. The reversal of 21324430413 is 31403442312.

21324430413 is a `hidden beast` number, since 2 + 1 + 3 + 244 + 3 + 0 + 413 = 666.

It is not a de Polignac number, because 21324430413 - 2¹⁴ = 21324414029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324430453) 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 39 ways as a sum of consecutive naturals, for example, 908923 + ... + 932088.

Almost surely, 2^21324430413 is an apocalyptic number.

It is an amenable number.

21324430413 is a deficient number, since it is larger than the sum of its proper divisors (16099661523).

21324430413 is a wasteful number, since it uses less digits than its factorization.

21324430413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841047 (or 1841038 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21324430413 its reverse (31403442312), we get a palindrome (52727872725).

The spelling of 21324430413 in words is "twenty-one billion, three hundred twenty-four million, four hundred thirty thousand, four hundred thirteen".