21121120222211 has 16 divisors (see below), whose sum is σ = 22337058078720. Its totient is φ = 19939770768960.

The previous prime is 21121120222159. The next prime is 21121120222231. The reversal of 21121120222211 is 11222202112112.

It is a cyclic number.

It is not a de Polignac number, because 21121120222211 - 2¹⁸ = 21121119960067 is a prime.

It is a super-2 number, since 2×21121120222211² (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 (21121120222231) 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, 8714435 + ... + 10871228.

It is an arithmetic number, because the mean of its divisors is an integer number (1396066129920).

Almost surely, 2^{21121120222211} is an apocalyptic number.

21121120222211 is a deficient number, since it is larger than the sum of its proper divisors (1215937856509).

21121120222211 is a wasteful number, since it uses less digits than its factorization.

21121120222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19586546.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21121120222211 its reverse (11222202112112), we get a palindrome (32343322334323).

The spelling of 21121120222211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, two hundred eleven".