21021200220213 has 28 divisors (see below), whose sum is σ = 32286099189708. Its totient is φ = 13672325327040.

The previous prime is 21021200220109. The next prime is 21021200220311. The reversal of 21021200220213 is 31202200212012.

21021200220213 is a `hidden beast` number, since 2 + 10 + 21 + 200 + 220 + 213 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2454555156804 + 18566645063409 = 1566702^2 + 4308903^2 .

It is not a de Polignac number, because 21021200220213 - 2³⁶ = 20952480743477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021200220913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 351624570 + ... + 351684347.

It is an arithmetic number, because the mean of its divisors is an integer number (1153074971061).

Almost surely, 2^{21021200220213} is an apocalyptic number.

It is an amenable number.

21021200220213 is a deficient number, since it is larger than the sum of its proper divisors (11264898969495).

21021200220213 is an frugal number, since it uses more digits than its factorization.

21021200220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703308976 (or 703308961 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21021200220213 its reverse (31202200212012), we get a palindrome (52223400432225).

The spelling of 21021200220213 in words is "twenty-one trillion, twenty-one billion, two hundred million, two hundred twenty thousand, two hundred thirteen".