21121020222211 has 96 divisors (see below), whose sum is σ = 26771186534400. Its totient is φ = 16311001674240.

The previous prime is 21121020222209. The next prime is 21121020222257. The reversal of 21121020222211 is 11222202012112.

It is not a de Polignac number, because 21121020222211 - 2¹ = 21121020222209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121020225211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5294813805 + ... + 5294817793.

It is an arithmetic number, because the mean of its divisors is an integer number (278866526400).

Almost surely, 2^{21121020222211} is an apocalyptic number.

21121020222211 is a deficient number, since it is larger than the sum of its proper divisors (5650166312189).

21121020222211 is a wasteful number, since it uses less digits than its factorization.

21121020222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629 (or 4616 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21121020222211 its reverse (11222202012112), we get a palindrome (32343222234323).

The spelling of 21121020222211 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twenty-two thousand, two hundred eleven".