21121212101011 has 16 divisors (see below), whose sum is σ = 23302859764320. Its totient is φ = 18983203022080.

The previous prime is 21121212101009. The next prime is 21121212101051. The reversal of 21121212101011 is 11010121212112.

It is not a de Polignac number, because 21121212101011 - 2¹ = 21121212101009 is a prime.

It is a super-2 number, since 2×21121212101011² (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 (21121212101051) 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, 7430745 + ... + 9872101.

It is an arithmetic number, because the mean of its divisors is an integer number (1456428735270).

Almost surely, 2^{21121212101011} is an apocalyptic number.

21121212101011 is a deficient number, since it is larger than the sum of its proper divisors (2181647663309).

21121212101011 is a wasteful number, since it uses less digits than its factorization.

21121212101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450294.

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

Adding to 21121212101011 its reverse (11010121212112), we get a palindrome (32131333313123).

The spelling of 21121212101011 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one hundred one thousand, eleven".