21112232011 has 4 divisors (see below), whose sum is σ = 22736249872. Its totient is φ = 19488214152.

The previous prime is 21112231999. The next prime is 21112232023. The reversal of 21112232011 is 11023221112.

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

It is an interprime number because it is at equal distance from previous prime (21112231999) and next prime (21112232023).

It is a cyclic number.

It is not a de Polignac number, because 21112232011 - 2⁷ = 21112231883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112232111) 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, 812008911 + ... + 812008936.

It is an arithmetic number, because the mean of its divisors is an integer number (5684062468).

Almost surely, 2^21112232011 is an apocalyptic number.

21112232011 is a deficient number, since it is larger than the sum of its proper divisors (1624017861).

21112232011 is a wasteful number, since it uses less digits than its factorization.

21112232011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624017860.

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

Adding to 21112232011 its reverse (11023221112), we get a palindrome (32135453123).

The spelling of 21112232011 in words is "twenty-one billion, one hundred twelve million, two hundred thirty-two thousand, eleven".