21033311011 has 8 divisors (see below), whose sum is σ = 22141874880. Its totient is φ = 19924901928.

The previous prime is 21033311003. The next prime is 21033311021. The reversal of 21033311011 is 11011333012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21033311011 - 2³ = 21033311003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033311021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330780 + ... + 389206.

It is an arithmetic number, because the mean of its divisors is an integer number (2767734360).

Almost surely, 2^21033311011 is an apocalyptic number.

21033311011 is a deficient number, since it is larger than the sum of its proper divisors (1108563869).

21033311011 is a wasteful number, since it uses less digits than its factorization.

21033311011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77393.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21033311011 its reverse (11011333012), we get a palindrome (32044644023).

The spelling of 21033311011 in words is "twenty-one billion, thirty-three million, three hundred eleven thousand, eleven".