21202120113 has 8 divisors (see below), whose sum is σ = 28280306208. Its totient is φ = 14129340384.

The previous prime is 21202120091. The next prime is 21202120117. The reversal of 21202120113 is 31102120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21202120113 - 2¹⁸ = 21201857969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202120092 and 21202120101.

It is not an unprimeable number, because it can be changed into a prime (21202120117) 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 7 ways as a sum of consecutive naturals, for example, 1342431 + ... + 1358132.

It is an arithmetic number, because the mean of its divisors is an integer number (3535038276).

Almost surely, 2^21202120113 is an apocalyptic number.

It is an amenable number.

21202120113 is a deficient number, since it is larger than the sum of its proper divisors (7078186095).

21202120113 is a wasteful number, since it uses less digits than its factorization.

21202120113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703183.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21202120113 its reverse (31102120212), we get a palindrome (52304240325).

Subtracting 21202120113 from its reverse (31102120212), we obtain a palindrome (9900000099).

The spelling of 21202120113 in words is "twenty-one billion, two hundred two million, one hundred twenty thousand, one hundred thirteen".