21200221021013 has 4 divisors (see below), whose sum is σ = 21200451542688. Its totient is φ = 21199990499340.

The previous prime is 21200221021009. The next prime is 21200221021037. The reversal of 21200221021013 is 31012012200212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200221021013 - 2² = 21200221021009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200221020982 and 21200221021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221051013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115122833 + ... + 115306838.

It is an arithmetic number, because the mean of its divisors is an integer number (5300112885672).

Almost surely, 2^{21200221021013} is an apocalyptic number.

It is an amenable number.

21200221021013 is a deficient number, since it is larger than the sum of its proper divisors (230521675).

21200221021013 is an equidigital number, since it uses as much as digits as its factorization.

21200221021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230521674.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21200221021013 its reverse (31012012200212), we get a palindrome (52212233221225).

The spelling of 21200221021013 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, twenty-one thousand, thirteen".