21213143035021 has 24 divisors (see below), whose sum is σ = 24880147501056. Its totient is φ = 18032755235040.

The previous prime is 21213143035009. The next prime is 21213143035153. The reversal of 21213143035021 is 12053034131212.

It is not a de Polignac number, because 21213143035021 - 2⁴¹ = 19014119779469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213143033021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15983515 + ... + 17259751.

It is an arithmetic number, because the mean of its divisors is an integer number (1036672812544).

Almost surely, 2^{21213143035021} is an apocalyptic number.

It is an amenable number.

21213143035021 is a deficient number, since it is larger than the sum of its proper divisors (3667004466035).

21213143035021 is a wasteful number, since it uses less digits than its factorization.

21213143035021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279049 (or 1279042 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21213143035021 its reverse (12053034131212), we get a palindrome (33266177166233).

The spelling of 21213143035021 in words is "twenty-one trillion, two hundred thirteen billion, one hundred forty-three million, thirty-five thousand, twenty-one".