21121110222011 has 16 divisors (see below), whose sum is σ = 21174988222080. Its totient is φ = 21067311914880.

The previous prime is 21121110221993. The next prime is 21121110222059. The reversal of 21121110222011 is 11022201112112.

It is a cyclic number.

It is not a de Polignac number, because 21121110222011 - 2¹⁴ = 21121110205627 is a prime.

It is a super-2 number, since 2×21121110222011² (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 (21121110212011) 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, 4412178560 + ... + 4412183346.

It is an arithmetic number, because the mean of its divisors is an integer number (1323436763880).

Almost surely, 2^{21121110222011} is an apocalyptic number.

21121110222011 is a deficient number, since it is larger than the sum of its proper divisors (53878000069).

21121110222011 is a wasteful number, since it uses less digits than its factorization.

21121110222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10954.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121110222011 its reverse (11022201112112), we get a palindrome (32143311334123).

The spelling of 21121110222011 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred twenty-two thousand, eleven".