21120230011 has 4 divisors (see below), whose sum is σ = 21122151192. Its totient is φ = 21118308832.

The previous prime is 21120230009. The next prime is 21120230051. The reversal of 21120230011 is 11003202112.

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

It is a cyclic number.

It is not a de Polignac number, because 21120230011 - 2¹ = 21120230009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120229973 and 21120230000.

It is not an unprimeable number, because it can be changed into a prime (21120230051) 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, 944005 + ... + 966118.

It is an arithmetic number, because the mean of its divisors is an integer number (5280537798).

Almost surely, 2^21120230011 is an apocalyptic number.

21120230011 is a deficient number, since it is larger than the sum of its proper divisors (1921181).

21120230011 is a wasteful number, since it uses less digits than its factorization.

21120230011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921180.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21120230011 its reverse (11003202112), we get a palindrome (32123432123).

The spelling of 21120230011 in words is "twenty-one billion, one hundred twenty million, two hundred thirty thousand, eleven".