21033213111 has 32 divisors (see below), whose sum is σ = 31818141120. Its totient is φ = 13728932352.

The previous prime is 21033213107. The next prime is 21033213137. The reversal of 21033213111 is 11131233012.

21033213111 is a `hidden beast` number, since 21 + 0 + 332 + 1 + 311 + 1 = 666.

It is not a de Polignac number, because 21033213111 - 2² = 21033213107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033213151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231081 + ... + 308973.

It is an arithmetic number, because the mean of its divisors is an integer number (994316910).

Almost surely, 2^21033213111 is an apocalyptic number.

21033213111 is a deficient number, since it is larger than the sum of its proper divisors (10784928009).

21033213111 is a wasteful number, since it uses less digits than its factorization.

21033213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78112 (or 78106 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21033213111 its reverse (11131233012), we get a palindrome (32164446123).

The spelling of 21033213111 in words is "twenty-one billion, thirty-three million, two hundred thirteen thousand, one hundred eleven".