21033321211 has 16 divisors (see below), whose sum is σ = 24297477120. Its totient is φ = 17834192640.

The previous prime is 21033321209. The next prime is 21033321241. The reversal of 21033321211 is 11212333012.

It is a cyclic number.

It is not a de Polignac number, because 21033321211 - 2¹ = 21033321209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033321241) 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, 1712430 + ... + 1724668.

It is an arithmetic number, because the mean of its divisors is an integer number (1518592320).

Almost surely, 2^21033321211 is an apocalyptic number.

21033321211 is a deficient number, since it is larger than the sum of its proper divisors (3264155909).

21033321211 is a wasteful number, since it uses less digits than its factorization.

21033321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14874.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21033321211 its reverse (11212333012), we get a palindrome (32245654223).

The spelling of 21033321211 in words is "twenty-one billion, thirty-three million, three hundred twenty-one thousand, two hundred eleven".