21120321113 has 8 divisors (see below), whose sum is σ = 22165990848. Its totient is φ = 20085267664.

The previous prime is 21120321077. The next prime is 21120321149. The reversal of 21120321113 is 31112302112.

It is an interprime number because it is at equal distance from previous prime (21120321077) and next prime (21120321149).

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

It is a cyclic number.

It is not a de Polignac number, because 21120321113 - 2¹⁴ = 21120304729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120321091 and 21120321100.

It is not an unprimeable number, because it can be changed into a prime (21120321193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649995 + ... + 2657952.

It is an arithmetic number, because the mean of its divisors is an integer number (2770748856).

Almost surely, 2^21120321113 is an apocalyptic number.

21120321113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21120321113 is a deficient number, since it is larger than the sum of its proper divisors (1045669735).

21120321113 is a wasteful number, since it uses less digits than its factorization.

21120321113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308143.

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

Adding to 21120321113 its reverse (31112302112), we get a palindrome (52232623225).

The spelling of 21120321113 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-one thousand, one hundred thirteen".