21210103021013 has 16 divisors (see below), whose sum is σ = 21723623644800. Its totient is φ = 20697510113280.

The previous prime is 21210103021001. The next prime is 21210103021061. The reversal of 21210103021013 is 31012030101212.

It is a cyclic number.

It is not a de Polignac number, because 21210103021013 - 2¹⁸ = 21210102758869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210103020982 and 21210103021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210103621013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288296753 + ... + 288370313.

It is an arithmetic number, because the mean of its divisors is an integer number (1357726477800).

Almost surely, 2^{21210103021013} is an apocalyptic number.

It is an amenable number.

21210103021013 is a deficient number, since it is larger than the sum of its proper divisors (513520623787).

21210103021013 is a wasteful number, since it uses less digits than its factorization.

21210103021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79772.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21210103021013 its reverse (31012030101212), we get a palindrome (52222133122225).

The spelling of 21210103021013 in words is "twenty-one trillion, two hundred ten billion, one hundred three million, twenty-one thousand, thirteen".