21011102211 has 8 divisors (see below), whose sum is σ = 30561603264. Its totient is φ = 12734001320.

The previous prime is 21011102191. The next prime is 21011102219. The reversal of 21011102211 is 11220111012.

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 21011102211 - 2¹⁰ = 21011101187 is a prime.

It is a super-2 number, since 2×21011102211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21011102219) 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, 318350001 + ... + 318350066.

It is an arithmetic number, because the mean of its divisors is an integer number (3820200408).

Almost surely, 2^21011102211 is an apocalyptic number.

21011102211 is a deficient number, since it is larger than the sum of its proper divisors (9550501053).

21011102211 is a wasteful number, since it uses less digits than its factorization.

21011102211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636700081.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011102211 its reverse (11220111012), we get a palindrome (32231213223).

The spelling of 21011102211 in words is "twenty-one billion, eleven million, one hundred two thousand, two hundred eleven".