21033111011 has 16 divisors (see below), whose sum is σ = 23017682688. Its totient is φ = 19060725600.

The previous prime is 21033110999. The next prime is 21033111023. The reversal of 21033111011 is 11011133012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21033110999) and next prime (21033111023).

It is a cyclic number.

It is not a de Polignac number, because 21033111011 - 2¹⁴ = 21033094627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033111311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5252336 + ... + 5256338.

It is an arithmetic number, because the mean of its divisors is an integer number (1438605168).

Almost surely, 2^21033111011 is an apocalyptic number.

21033111011 is a deficient number, since it is larger than the sum of its proper divisors (1984571677).

21033111011 is a wasteful number, since it uses less digits than its factorization.

21033111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21033111011 its reverse (11011133012), we get a palindrome (32044244023).

The spelling of 21033111011 in words is "twenty-one billion, thirty-three million, one hundred eleven thousand, eleven".