21213404502434 has 16 divisors (see below), whose sum is σ = 31938767441280. Its totient is φ = 10567149603600.

The previous prime is 21213404502431. The next prime is 21213404502503. The reversal of 21213404502434 is 43420540431212.

It is a super-2 number, since 2×21213404502434² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213404502394 and 21213404502403.

It is not an unprimeable number, because it can be changed into a prime (21213404502431) 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 7 ways as a sum of consecutive naturals, for example, 61883609 + ... + 62225459.

It is an arithmetic number, because the mean of its divisors is an integer number (1996172965080).

Almost surely, 2^{21213404502434} is an apocalyptic number.

21213404502434 is a deficient number, since it is larger than the sum of its proper divisors (10725362938846).

21213404502434 is a wasteful number, since it uses less digits than its factorization.

21213404502434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457465.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21213404502434 its reverse (43420540431212), we get a palindrome (64633944933646).

The spelling of 21213404502434 in words is "twenty-one trillion, two hundred thirteen billion, four hundred four million, five hundred two thousand, four hundred thirty-four".