21033212011 has 16 divisors (see below), whose sum is σ = 24647813568. Its totient is φ = 17571916800.

The previous prime is 21033211987. The next prime is 21033212029. The reversal of 21033212011 is 11021233012.

It is a cyclic number.

It is not a de Polignac number, because 21033212011 - 2¹³ = 21033203819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033212411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269971 + ... + 339043.

It is an arithmetic number, because the mean of its divisors is an integer number (1540488348).

Almost surely, 2^21033212011 is an apocalyptic number.

21033212011 is a deficient number, since it is larger than the sum of its proper divisors (3614601557).

21033212011 is a wasteful number, since it uses less digits than its factorization.

21033212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70182.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21033212011 its reverse (11021233012), we get a palindrome (32054445023).

The spelling of 21033212011 in words is "twenty-one billion, thirty-three million, two hundred twelve thousand, eleven".