21021111221011 has 8 divisors (see below), whose sum is σ = 22933314763200. Its totient is φ = 19109106584040.

The previous prime is 21021111220987. The next prime is 21021111221057. The reversal of 21021111221011 is 11012211112012.

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

It is not a de Polignac number, because 21021111221011 - 2¹⁵ = 21021111188243 is a prime.

It is a super-2 number, since 2×21021111221011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021111221311) 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, 49505281 + ... + 49928098.

It is an arithmetic number, because the mean of its divisors is an integer number (2866664345400).

Almost surely, 2^{21021111221011} is an apocalyptic number.

21021111221011 is a deficient number, since it is larger than the sum of its proper divisors (1912203542189).

21021111221011 is a wasteful number, since it uses less digits than its factorization.

21021111221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99452609.

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

Adding to 21021111221011 its reverse (11012211112012), we get a palindrome (32033322333023).

The spelling of 21021111221011 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, eleven".