21120045011 has 4 divisors (see below), whose sum is σ = 22744663872. Its totient is φ = 19495426152.

The previous prime is 21120045007. The next prime is 21120045019. The reversal of 21120045011 is 11054002112.

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 21120045011 - 2² = 21120045007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120045019) 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, 812309411 + ... + 812309436.

It is an arithmetic number, because the mean of its divisors is an integer number (5686165968).

Almost surely, 2^21120045011 is an apocalyptic number.

21120045011 is a deficient number, since it is larger than the sum of its proper divisors (1624618861).

21120045011 is a wasteful number, since it uses less digits than its factorization.

21120045011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624618860.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21120045011 its reverse (11054002112), we get a palindrome (32174047123).

The spelling of 21120045011 in words is "twenty-one billion, one hundred twenty million, forty-five thousand, eleven".