21001330211 has 16 divisors (see below), whose sum is σ = 22638888960. Its totient is φ = 19419315840.

The previous prime is 21001330187. The next prime is 21001330213. The reversal of 21001330211 is 11203310012.

It is a cyclic number.

It is not a de Polignac number, because 21001330211 - 2³⁴ = 3821461027 is a prime.

It is a super-2 number, since 2×21001330211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001330213) 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, 295691 + ... + 359771.

It is an arithmetic number, because the mean of its divisors is an integer number (1414930560).

Almost surely, 2^21001330211 is an apocalyptic number.

21001330211 is a deficient number, since it is larger than the sum of its proper divisors (1637558749).

21001330211 is a wasteful number, since it uses less digits than its factorization.

21001330211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64514.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21001330211 its reverse (11203310012), we get a palindrome (32204640223).

The spelling of 21001330211 in words is "twenty-one billion, one million, three hundred thirty thousand, two hundred eleven".