21122120113 has 4 divisors (see below), whose sum is σ = 21124186468. Its totient is φ = 21120053760.

The previous prime is 21122120077. The next prime is 21122120119. The reversal of 21122120113 is 31102122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10182424464 + 10939695649 = 100908^2 + 104593^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122120113 - 2²¹ = 21120022961 is a prime.

It is a super-2 number, since 2×21122120113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122120119) 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, 1017768 + ... + 1038313.

It is an arithmetic number, because the mean of its divisors is an integer number (5281046617).

Almost surely, 2^21122120113 is an apocalyptic number.

It is an amenable number.

21122120113 is a deficient number, since it is larger than the sum of its proper divisors (2066355).

21122120113 is a wasteful number, since it uses less digits than its factorization.

21122120113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066354.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21122120113 its reverse (31102122112), we get a palindrome (52224242225).

The spelling of 21122120113 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred thirteen".